@BOOK {SMITH:1995a,
title = {Caracterisation socio-economique des environnments et des technologies: Guide de recherche de l'Iita, No. 50},
author = {Smith, J. },
series = {Guide de recherche de l'Iita, No. 50},
year = {1995},
month = {March},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {37p.},
}