APA-ийн эшлэл(7 дахь хэвлэлт)

Levy, S. (2011). Once & future giants: What Ice Age extinctions tell us about the fate of earth's largest animals. Oxford University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Levy, Sharon. Once & Future Giants: What Ice Age Extinctions Tell Us About the Fate of Earth's Largest Animals. Oxford ; New York: Oxford University Press, 2011.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Levy, Sharon. Once & Future Giants: What Ice Age Extinctions Tell Us About the Fate of Earth's Largest Animals. Oxford University Press, 2011.