Practical manual for the culture of the African catfish (Clarias gariepinus): W.J.A.R. Viveen, C.J.J. Richter, P.G.W.J. van Oordt, J.A.L. Janssen and E.A. Huisman. Joint publication of the Directorate General for International Cooperation, Ministry of Foreign Affairs, The Hague, Department of Fish Culture and Fisheries, Agricultural University, Wageningen, and Research Group for Comparative Endocrinology, Department of Zoology, University of Utrecht, The Netherlands. 1985, 122 pp