Guttman, B. S. (1999). Student study guide to accompany Biology. WCB/McGraw-Hill.
Trích dẫn kiểu ChicagoGuttman, Burton S. Student Study Guide to Accompany Biology. WCB/McGraw-Hill, 1999.
Deismireacht MLAGuttman, Burton S. Student Study Guide to Accompany Biology. WCB/McGraw-Hill, 1999.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.