@type t() :: %Gleanex.Client.ChatMessageCitation{
  referenceRanges: [Gleanex.Client.ReferenceRange.t()] | nil,
  sourceCustomEntity: Gleanex.Client.CustomEntity.t() | nil,
  sourceDocument: Gleanex.Client.Document.t() | nil,
  sourceFile: Gleanex.Client.ChatFile.t() | nil,
  sourcePerson: Gleanex.Client.Person.t() | nil,
  trackingToken: String.t() | nil
}