Cita APA (7th ed.)
Black, G. (1992). Iowa birdlife. Published for the Nature Conservancy by the University of Iowa Press.
Cita Chicago (17th ed.)
Black, Gladys. Iowa Birdlife. Iowa City: Published for the Nature Conservancy by the University of Iowa Press, 1992.
Cita MLA (9th ed.)
Black, Gladys. Iowa Birdlife. Published for the Nature Conservancy by the University of Iowa Press, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.