@book{51617,
	author = {Frankfort-Nachmias, Chava. and Nachmias, David.},
	title = {Research methods in the social sciences},
	publisher = {St. Martin's Press},
	year = {c1992.},
	address = {New York},
	edition = {4th ed.},
	note = {Rev. ed. of: Research methods in the social sciences / David Nachmias, Chava Nachmias. 3rd. ed. 1987.}
}