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.