@book{30006,
	author = {Blalock, Ann B. and Blalock, Hubert M.},
	title = {Introduction to social research},
	publisher = {Prentice-Hall},
	year = {c1982.},
	series = {Prentice-Hall foundations of modern sociology series},
	address = {Englewood Cliffs, N.J.},
	edition = {2nd ed.},
	note = {Rev. ed. of: An introduction to social research / Hubert M. Blalock, Jr. 1st ed. 1970.}
}