APA-ийн эшлэл(7 дахь хэвлэлт)

Pfennig, D. W., & Pfennig, K. S. (2012). Evolution's wedge: Competition and the origins of diversity. University of California Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Pfennig, David W., ба Karin S. Pfennig. Evolution's Wedge: Competition and the Origins of Diversity. Berkeley: University of California Press, 2012.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Pfennig, David W., ба Karin S. Pfennig. Evolution's Wedge: Competition and the Origins of Diversity. University of California Press, 2012.