| 4.1 | Variety of Life
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| (1) | Advanced-level Biology for Hong Kong, by Y.K. Ho, SNP Manhattan Press (H.K.) Ltd. Bk 1, p. |
| (2) | BIOLOGY for Advanced Level, 4th ed.,by Glenn and Susan Toole,Stanley Thornes : p. |
| (3) | A-level Biology,by Phillips and Chilton,Oxford University Press : p. |
| (4) | Advanced Biology, principles and applications, ISE, by C.J. Clegg with D.G. Mackean, John Murray, p. |
| (5) | Biology : Principles and Processes, by Roberts, Reiss and Monger, Nelson International Edition, p. |