@book{48415,
	author = {Rabe-Hesketh, S. and Skrondal, Anders},
	title = {Multilevel and longitudinal modeling using stata},
	publisher = {Stata Press Publication, },
	year = {2012.},
	address = {College Station (Texas): },
	edition = {3rd. ed.},
	note = {Incluye índice.}
}