@book{83157,
	author = {Ruíz Ramírez, José Adrian. and Pérez Sánchez, Agustín.},
	title = {Estudio geohidrológico en San Bartolomé Hueyapan, Municipio de Tepeaca, Puebla},
	publisher = {El autor,},
	year = {2000.},
	address = {Chapingo, Méx. :}
}