Norman, M. J. T. <br/><br/>
The ecology of tropical food crops / 
M.J.T. Norman, C.J. Pearson & P.G.E. Searle. 
 - 2nd ed. 
 - Cambridge ;  New York :  Cambridge University Press,  1995. 
 - x, 430 p. :  ill., maps ;  24 cm.