@book{80642,
	author = {Anaya Caballero, Dulce Carolina. and Valera Venegas, Gricelda.},
	title = {Estudio integral del valle de Tehuacán, Puebla-Cuicatlán, Oaxaca},
	publisher = {El autor,},
	year = {2000.},
	address = {Chapingo, Méx. :}
}