@book{131258,
	author = {Pollock, Philip H., and Pollock, Philip H.,},
	title = {A Stata companion to political analysis /},
	publisher = {CQ Press,},
	year = {c2011.},
	address = {Washington, D.C. :},
	note = {Companion text to: Essentials of political analysis / Philip H. Pollock III, 2nd ed.}
}