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