Rubin, Allen. Essential research methods for social work / Allen Rubin, Earl Babbie. - 3rd ed. - Belmont, CA : Brooks/Cole Cengage Learning, 2013. - xv, 397 p. : ill. ; 26 cm. - Brooks/Cole empowerment series . - Brooks/Cole empowerment series. . ISBN: 9780840029133 (pbk.) RM390.11 Subjects--Topical Terms: Social service--Research--Methodology.