Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.