@book{32643,
	author = {Kothari, C. R.,},
	title = {Research methodology},
	publisher = {New Age International (P) Ltd.,},
	year = {2019.},
	address = {New Delhi :},
	edition = {Cuarta edicion.},
	note = {Reprint of 2nd ed. Originally published: New Delhi : Wishwa Prakashan, 1990.}
}