@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.},
}