@BOOK {DVORAK:1995, title = {Besoins en main-d'oeuvre et evaluation des technologies: Guide de recherche de l'Iita, No. 27}, author = {Dvorak, K. A. }, series = {Guide de recherche de l'Iita, No. 27}, year = {1995}, month = {February}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {15p.}, }