APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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