@BOOK {COUPER:1995a, title = {Aquatic resources of agriculture research stations: IITA research guide, No. 23}, author = {Couper, D. C. }, series = {IITA research guide, No. 23}, year = {1995}, month = {September}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {17p.}, }