Etuk, E. U. I., H. I. Petters, S. R. A. Adewusi, E. M. Archibong, and E. O. Isuk. 2002. “Physicochemical, Microbial and in Vivo Analysis of Some Nigerian Edible Clays”. The Indian Journal of Nutrition and Dietetics 39 (2):63-70. https://informaticsjournals.co.in/index.php/ijnd/article/view/6811.