The best replacement for citation is reference.

The best alternatives to citation are rated as following:
★★★★★  reference
★★★★★  ticket
★★★★  arrest
★★★  bibliography
★★  misdemeanor
★  violation
★  warning
★  quotation
★  footnote
★  summons
★  reference apa
★  conviction
★  reference list
★  gulfstream
★  source
  mla citation
  gallant fox
  learjet
  apa citation
  lear
  quote
  apa
  commendation
  infraction
  secretariat
  footnotes

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Speaking about citation, one probably shouldn't forget about et al.

Other search terms related to citation and their ratings are:
★★★★★ et al
★★★ author
★★ no author mla
★★ more than one author
★★ apa
★ question mark
quotes
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Google Trends

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citation
reference
ticket