1. Self inhibition of growth in Rana pipiens tadpoles;Akin;Physiol. Zoöl.,1966
2. “Principles of Animal Ecology”;Allee,1949
3. “The Distribution and Abundance of Animals”;Andrewartha,1954
4. The use of molluscicides in Egypt;Ayad;Bull. Wld Hlth Org.,1961
5. Physiological group differentiation in Lymnaea columella;Baily,1939