APA-ийн эшлэл(7 дахь хэвлэлт)

Krutch, J. W., & Landacre, P. (2009). The great chain of life (1st University of Iowa Press ed.). University of Iowa Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Krutch, Joseph Wood, ба Paul Landacre. The Great Chain of Life. 1st University of Iowa Press ed. Iowa City: University of Iowa Press, 2009.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Krutch, Joseph Wood, ба Paul Landacre. The Great Chain of Life. 1st University of Iowa Press ed. University of Iowa Press, 2009.