public sealed class SearchResponse.Types.Summary.Types.CitationSource : IMessage<SearchResponse.Types.Summary.Types.CitationSource>, IEquatable<SearchResponse.Types.Summary.Types.CitationSource>, IDeepCloneable<SearchResponse.Types.Summary.Types.CitationSource>, IBufferMessage, IMessage
Reference documentation and code samples for the Discovery Engine v1 API class SearchResponse.Types.Summary.Types.CitationSource.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003eThis documentation page covers the \u003ccode\u003eCitationSource\u003c/code\u003e class, which is part of the \u003ccode\u003eGoogle.Cloud.DiscoveryEngine.V1\u003c/code\u003e namespace and is used in the Discovery Engine v1 API.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version documented is 1.6.0, and multiple previous versions of the \u003ccode\u003eCitationSource\u003c/code\u003e class are accessible through links, including 1.5.0, 1.4.0, 1.3.0, 1.2.0, 1.1.0, and 1.0.0-beta06.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eCitationSource\u003c/code\u003e class implements multiple interfaces such as \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e, and inherits from \u003ccode\u003eobject\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eIt has a \u003ccode\u003eReferenceIndex\u003c/code\u003e property that is a long integer, representing a document reference index from \u003ccode\u003eSummaryWithMetadata.references\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eCitationSource\u003c/code\u003e class has two constructors, one that is empty, and one that takes another \u003ccode\u003eCitationSource\u003c/code\u003e as a parameter.\u003c/p\u003e\n"]]],[],null,["# Discovery Engine v1 API - Class SearchResponse.Types.Summary.Types.CitationSource (1.9.0)\n\nVersion latestkeyboard_arrow_down\n\n- [1.9.0 (latest)](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.8.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.8.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.7.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.7.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.6.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.6.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.5.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.5.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.4.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.4.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.3.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.3.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.2.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.2.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.1.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.1.0/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource)\n- [1.0.0-beta06](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.0.0-beta06/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource) \n\n public sealed class SearchResponse.Types.Summary.Types.CitationSource : IMessage\u003cSearchResponse.Types.Summary.Types.CitationSource\u003e, IEquatable\u003cSearchResponse.Types.Summary.Types.CitationSource\u003e, IDeepCloneable\u003cSearchResponse.Types.Summary.Types.CitationSource\u003e, IBufferMessage, IMessage\n\nReference documentation and code samples for the Discovery Engine v1 API class SearchResponse.Types.Summary.Types.CitationSource.\n\nCitation source. \n\nInheritance\n-----------\n\n[object](https://learn.microsoft.com/dotnet/api/system.object) \\\u003e SearchResponse.Types.Summary.Types.CitationSource \n\nImplements\n----------\n\n[IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage-1.html)[SearchResponse](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse)[Types](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types)[Summary](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary)[Types](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types)[CitationSource](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource), [IEquatable](https://learn.microsoft.com/dotnet/api/system.iequatable-1)[SearchResponse](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse)[Types](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types)[Summary](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary)[Types](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types)[CitationSource](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource), [IDeepCloneable](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IDeepCloneable-1.html)[SearchResponse](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse)[Types](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types)[Summary](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary)[Types](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types)[CitationSource](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.SearchResponse.Types.Summary.Types.CitationSource), [IBufferMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IBufferMessage.html), [IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage.html) \n\nInherited Members\n-----------------\n\n[object.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.object.gethashcode) \n[object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype) \n[object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)\n\nNamespace\n---------\n\n[Google.Cloud.DiscoveryEngine.V1](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1)\n\nAssembly\n--------\n\nGoogle.Cloud.DiscoveryEngine.V1.dll\n\nConstructors\n------------\n\n### CitationSource()\n\n public CitationSource()\n\n### CitationSource(CitationSource)\n\n public CitationSource(SearchResponse.Types.Summary.Types.CitationSource other)\n\nProperties\n----------\n\n### ReferenceIndex\n\n public long ReferenceIndex { get; set; }\n\nDocument reference index from SummaryWithMetadata.references.\nIt is 0-indexed and the value will be zero if the reference_index is\nnot set explicitly."]]
