Dyfyniad APA

Purves, W. K., & Orians, G. H. (1983). Life: The science of biology. W. Grant Press.

Dyfyniad Arddull Chicago

Purves, William Kirkwood, and Gordon H. Orians. Life: The Science of Biology. Sinauer Associates: W. Grant Press, 1983.

Dyfyniad MLA

Purves, William Kirkwood, and Gordon H. Orians. Life: The Science of Biology. W. Grant Press, 1983.

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