@book{4227,
	author = {Aliaga Cárdenas, Rolando and Bernal Malagón, Henry Yesid,},
	title = {Guía para el cultivo, aprovechamiento y conservación de la maca},
	publisher = {Convenio Andrés Bello,},
	year = {1999..},
	address = {Bogotá : }
}