Dyfyniad APA

Sandra S. Gottfried. (1993). Biology today (With 777 illustrations). St. Louis, Missouri: Mosby.

Dyfyniad Arddull Chicago

Sandra S. Gottfried. Biology Today (With 777 Illustrations). St. Louis, Missouri: Mosby, 1993.

Dyfyniad MLA

Sandra S. Gottfried. Biology Today (With 777 Illustrations). St. Louis, Missouri: Mosby, 1993.

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