Perry, John A. Contemporary society : an introduction to social science / John A. Perry, Erna K. Perry. - 9th ed. - Boston : Allyn and Bacon, c2000. - xx, 539 p. : ill. ; 23 cm. References : p. 504-515. ISBN: 0321044622 paper back Subjects--Topical Terms: Social sciences LC Class. No.: H85 / C76 2000