U. S. Government Printing Office. (1953). Style manual (abridged) (Rev. ed.).
Chicago Style aipamenaU. S. Government Printing Office. Style Manual (abridged). Rev. ed. Washington, 1953.
MLA aipamenaU. S. Government Printing Office. Style Manual (abridged). Rev. ed. 1953.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.