#quotation__citation__credit__reference__mention  a short note acknowledging a source of information or quoting a passage; "the student's essay failed to list several important citations"; "the article includes mention of similar clinical cases"
  supertype:  #annotation__note__notation  a comment (usually added to a text); "his notes were appended at the end of the article"
  subtype:  #photo_credit__photocredit  a note acknowledging the source of a published photograph
  subtype:  #cross-reference__crossreference__cross-index__crossindex  a reference at one place in a work to information at another place in the same work

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