APA aipamena

(1968). United States government correspondence manual. U.S. Government Printing Office.

Chicago Style aipamena

United States Government Correspondence Manual. Washington: U.S. Government Printing Office, 1968.

MLA aipamena

United States Government Correspondence Manual. U.S. Government Printing Office, 1968.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.