@book{163899,
	author = {Morua Beltran, María de los Angeles and Hurtado Rosillo, Gerardo},
	title = {Contenido mineral de gramíneas forrajeras tropicales en Puyacatengo, Tabasco  /},
	publisher = {El autor,},
	year = {1991},
	address = {Chapingo, Méx.  :}
}