Kruuk, H. & Goudswaard, P.C. (1990). "Effects of changes in fish populations in Lake Victoria on the food of otters (Lutra maculicollis Schinz and Aonyx capensis Lichtenstein)". African Journal of Ecology. 28 (4): 322–329. Bibcode:1990AfJEc..28..322K. doi:10.1111/j.1365-2028.1990.tb01167.x.
Kruuk, H. & Goudswaard, P.C. (1990). "Effects of changes in fish populations in Lake Victoria on the food of otters (Lutra maculicollis Schinz and Aonyx capensis Lichtenstein)". African Journal of Ecology. 28 (4): 322–329. Bibcode:1990AfJEc..28..322K. doi:10.1111/j.1365-2028.1990.tb01167.x.