APA (7th ed.) Zitazioa
Black, G. (1992). Iowa birdlife. Published for the Nature Conservancy by the University of Iowa Press.
Chicago Style (17th ed.) Zitazioa
Black, Gladys. Iowa Birdlife. Iowa City: Published for the Nature Conservancy by the University of Iowa Press, 1992.
MLA (9th ed.) Zitazioa
Black, Gladys. Iowa Birdlife. Published for the Nature Conservancy by the University of Iowa Press, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.