Dyfyniad APA

Pack, P. E. (2001). CliffsAP biology (2nd ed.). IDG Books Worldwide.

Dyfyniad Arddull Chicago

Pack, Phillip E. CliffsAP Biology. 2nd ed. Foster City, CA: IDG Books Worldwide, 2001.

Dyfyniad MLA

Pack, Phillip E. CliffsAP Biology. 2nd ed. IDG Books Worldwide, 2001.

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