* E.P Solomon, L.R Berg, and D.W Martin (editor); "Biology"; Thomson Learning Inc; ISBN 0-534-39175-3 (6th edition, hardcover, 2002).
* E.P Solomon, L.R Berg, and D.W Martin (editor); "Biology"; Thomson Learning Inc; ISBN 0-534-39175-3 (6th edition, hardcover, 2002).