Citazione Stile APA (7a Edizione)

Black, G. (1992). Iowa birdlife. Published for the Nature Conservancy by the University of Iowa Press.

Citazione stile Chigago Style (17a edizione)

Black, Gladys. Iowa Birdlife. Iowa City: Published for the Nature Conservancy by the University of Iowa Press, 1992.

Citatione MLA (9a ed.)

Black, Gladys. Iowa Birdlife. Published for the Nature Conservancy by the University of Iowa Press, 1992.