Cita APA (7a ed.)

Levy, S. (2011). Once and future giants: What ice age extinctions tell us about the fate of earth's largest animals. Oxford university press.

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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