(1) | Immunology, an outline for students of medicine and biology, by D.M. Weir, E.L.B.S., pp. 1 - 103. |
(2) | A-Level Biology, by Phillips and Chilton, Oxford Press pp. 141 - 149. |
(3) | Advanced Biology, Principles and applications, by C.J.Clegg with D.G. Mackean, International student edition, John Murray Press, pp. 368 - 375. |
(4) | Understanding Biology, for Advanced Level, 4th ed.,by Glenn and Susan Toole, Stanley Thornes Press, pp.626-646. |
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