^ ab1:1,000,000 - International Map of the World U.S. Army Map Service, Sheet NB-32 (Douala), 2nd Ed., April 1962
^van der Knaap, Martin (1994) Status of fish stocks and fisheries of thirteen medium-sized African reservoirs CIFA technical paper #26, Committee for Inland Fisheries of Africa (CIFA), Food and Agriculture Organization of the United Nations (FAO), Rome, page 11, ISBN92-5-103581-4
^van der Knaap, Martin (1994) Status of fish stocks and fisheries of thirteen medium-sized African reservoirs CIFA technical paper #26, Committee for Inland Fisheries of Africa (CIFA), Food and Agriculture Organization of the United Nations (FAO), Rome, page 11, ISBN92-5-103581-4 citing Vanden Bossche, J. P. and Bernacsek, G. M. (1990) Source book for the inland fishery resources of Africa: vol. 1 CIFA technuical paper #18.1, Committee for Inland Fisheries of Africa (CIFA), Food and Agriculture Organization of the United Nations (FAO), Rome, ISBN92-5-102983-0