Aziz Nor Azlina Abd, dkk .2007. Biology For STPM Volume 1. Singapore: Thomson Learning, Inc
-----------. 2007. Biology For STPM Volume 2. Singapore: Thomson Learning, Inc
Boyle M dan Kathryn S. 2002. Biology. London: HaperCollinsPublishers Limited
Hoong, T.L, Leng H,P. 2001. Interactive Science. Singapore: SNP Pan
Pacific Publishing Pte, Ltd Farndon, John. 2000. Human Body. China: Miles Kelly Publishing
Mader, S.S.2001. Biology. New York: Mc Graw-Hill
R Michael dan Neil Ingram.2001. Biology. United Kingdom: Nelson University.
http://www.sciencenewsforkids.org
http://myscienceblogs.com
