1. Banwell J. G. (1984): Malabsorption syndromes. In: Tropical and Geographical Medicine, Warren, K.S. and Mahmoud, A.A.F. 1st Ed. p 1429. McGraw-Hill Book Company, New York.
2. Bray B. (1953): Nitrogen metabolism in West African Children Brit. J. Nutr. 7: 3.
3. Cameron N. (1978): In human growth, Vol. 2, Bailliere Tindall, London.
4. Chatterju A., Basu S.P. and A.B. Chowdhury (1968): Preliminary observations on the digestive proteolytic enzymes in ascariasis. Bull. Calcutta School Trop. Med. 16: 9.
5. Collier H. B. (1941): Canad. J. Res., 19, B91: Quoted from Venkatachalam and Patwardhan, 1953. Trans. R. Soc. Trop. Med. Hyg., 47: 169–174.