@book{3321,
	author = {Long, J. Scott. and Freese, Jeremy.},
	title = {Regression models for categorical dependent variables using Stata /},
	publisher = {StataCorp LP,},
	year = {c2006.},
	address = {College Station, Texas :},
	edition = {2nd ed.},
	note = {"A Stata Press publication."},
	url = {http://www.loc.gov/catdir/enhancements/fy0916/2009284055-d.html}
}