Dyfyniad APA

Purves/Orians. (1987). The Science Of Biology. Sinauer Association Inc.

Dyfyniad Arddull Chicago

Purves/Orians. The Science Of Biology. Sinauer Association Inc, 1987.

Dyfyniad MLA

Purves/Orians. The Science Of Biology. Sinauer Association Inc, 1987.

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