APA (7th ed.) Zitazioa
(1986). Grammar and composition (Fourth course.). Houghton Mifflin.
Chicago Style (17th ed.) Zitazioa
Grammar and Composition. Fourth course. Boston: Houghton Mifflin, 1986.
MLA (9th ed.) Zitazioa
Grammar and Composition. Fourth course. Houghton Mifflin, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.