@book{16783,
	author = {Jans, Fred C. and E.U.A. Department of Agriculture.},
	title = {El servicio de extensión agrícola examina la planeación de programas},
	publisher = {Centro Regional de Ayuda Técnica,},
	year = {1965 (c.1960)},
	address = {México, D.F., :}
}