@book{783,
	author = {Marín M., Gildardo and Lora S., Rodrigo},
	title = {Acidez y encalamiento de los suelos /},
	publisher = {ICA,},
	year = {1979.},
	series = {Boletín didáctico},
	address = {Bogotá :},
	edition = {3a. edición}
}