@BOOK {HARTLEY:1992, title = {Systems d'irrigation pour les fermes experimentales: Guide de recherche de l'Iita, No. 14}, author = {Hartley, P. V. }, series = {Guide de recherche de l'Iita, No. 14}, year = {1992}, month = {February}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {20p.}, }