1. Gilbert, L. I. and King, D. S. (1973), in The Physiology of Insecta, Second Edition ,(Ed.) M. Rockstein, Vol. I, pp. 249–370, Academic Press, New York.
2. Doane, W. W. (1973), in Developmental Systems: Insects ,(Ed.) S. J. Counce and C. H. Waddington, Vol. 2, pp. 291–497, Academic Press, New York.
3. Vedeckis, W. V., Bollenbacher, W. E. and Gübert, L. I. (1916). Molecular and Cellular Endocrinol ,5, 81–88.
4. Ashworth, J. M. (1973), Cell Differentiation, Chapman and Hall, London.
5. Hadorn, E. (1965), Brookhaven Symp. Biol. 18,148–161.