@book{63373,
	author = {Ortiz Villanueva, Godofredo Bonifacio. and Ortiz Solorio, Carlos Alberto.},
	title = {Edafología},
	publisher = {UACH. Departamento de Suelos,},
	year = {1984},
	address = {Chapingo, Méx. :},
	edition = {4 ed.}
}