@book{167574,
	author = {Ortíz Villanueva, Bonifacio and Ortíz Solorio, Carlos Alberto, coaut. and UACh. Departamento de Suelos},
	title = {Edafología  /},
	publisher = {Departamento de Suelos,},
	year = {1987},
	address = {UACh :},
	edition = {6a ed.}
}