1. Adeniyi HA, Aluma SS, Okor DJ, Obot FA. 1985 Preliminary study on the pesticide residues in the Kainji and Jebba Lakes area. National Institute for Freshwater Fisheries Research (NIFFR), Kainji-New Bussa
2. Alloway BJ (ed). 1990 Heavy Metals in Soils. Blackie, Glasgow
3. Annune PA, Iyaniwura TT. 1993 Accumulation of two trace metals in tissues of freshwater fishes Oreochromis niliticus and Clarias gariepinus . J Aquat Food Product Technol 2, 54–59
4. Bernasconi GB. 1996 AXIL-quantitative X-ray Analysis System, Instruction Manual. IAEA, Vienna
5. Bio-Elite. 2000 Webmaster@bio-elite.com