Dyfyniad APA

Collins, J. P., & Crump, M. L. (2009). Extinction in our times: Global amphibian decline. Oxford University Press.

Dyfyniad Arddull Chicago

Collins, James P., and Martha L. Crump. Extinction in Our Times: Global Amphibian Decline. Oxford ; New York: Oxford University Press, 2009.

Dyfyniad MLA

Collins, James P., and Martha L. Crump. Extinction in Our Times: Global Amphibian Decline. Oxford University Press, 2009.

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