@BOOK {HORTON:1991, title = {Enquetes en milieu paysan au tiers-monde: Guide de recherche de l'Iita, No. 31}, author = {Horton, D. }, series = {Guide de recherche de l'Iita, No. 31}, year = {1991}, month = {December}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {35p.}, }