Dyfyniad APA
Craw, R. C., Grehan, J. R., & Heads, M. J. (1999). Panbiogeography: Tracking the history of life. Oxford University Press.
Dyfyniad Arddull Chicago
Craw, R. C., John R. Grehan, and Michael J. Heads. Panbiogeography: Tracking the History of Life. New York: Oxford University Press, 1999.
Dyfyniad MLA
Craw, R. C., et al. Panbiogeography: Tracking the History of Life. Oxford University Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.