Dyfyniad APA

ebrary, Inc, Burke, E., & Pomeranz, K. (2009). The environment and world history. University of California Press.

Dyfyniad Arddull Chicago

ebrary, Inc, Edmund Burke, and Kenneth Pomeranz. The Environment and World History. Berkeley: University of California Press, 2009.

Dyfyniad MLA

ebrary, Inc, et al. The Environment and World History. University of California Press, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.