@book{1150,
	author = {Havlin, John L. and Tisdale, Samuel L.},
	title = {Soil fertility and fertilizers :},
	publisher = {Pearson,},
	year = {2013},
	address = {Boston, USA :},
	edition = {Eighth edition.},
	url = {https://itmsp.museknowledge.com/UOH?qurl=https://libros-uoh.uoh.cl//ebook_2/soil-fertility-and-fertilizersand-introduction-to-nutrient-management/}
}