@BOOK {RHOADES:1992a, title = {L'art de mener des enquetes informelles sur le terrain: Guide de recherche de l'Iita, No. 36}, author = {Rhoades, R. E. }, series = {Guide de recherche de l'Iita, No. 36}, year = {1992}, month = {August}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {66p.}, }