@book{3412,
	author = {Ashenfelter, Orley C. and Layard, Richard},
	title = {Handbook of Labor Economics.},
	publisher = {North Holland [Imprint]},
	year = {Feb. 1987},
	address = {San Diego : },
	edition = {Vol  2},
	url = {http://www.columbia.edu/cgi-bin/cul/resolve?clio10175651}
}