Levy, S. (2011). Once & future giants: What Ice Age extinctions tell us about the fate of earth's largest animals. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (9ú heag.)Levy, Sharon. Once & Future Giants: What Ice Age Extinctions Tell Us About the Fate of Earth's Largest Animals. Oxford University Press, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.