@book{13776,
	author = {Asher, Herbert B. and Lewis-Beck, Michael S. (series editor)},
	title = {Causal modeling /},
	publisher = {Sage Publications,},
	year = {c1983.},
	series = {Quantitative applications in the social sciences ;},
	address = {Beverly Hills ;:},
	edition = {2nd ed.}
}