@book{39633,
	author = {Nachmias, David. and Frankfort-Nachmias, Chava.},
	title = {Research methods in the social sciences /},
	publisher = {St. Martin's Press,},
	year = {c1981.},
	address = {New York :},
	edition = { 2nd ed.},
	note = {Authors' names in reverse order in previous editions.}
}