Gaya APA

Rick, T, C., Erlandson, J, M. (2008). Human Impacts on Ancient Marine Ecosystems . Barkeley: Universty of california press.

Gaya MLA

Rick, Torben, C.., Erlandson, Jon, M.. "Human Impacts on Ancient Marine Ecosystems". Barkeley: Universty of california press, 2008. Text.