@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.},
}