Kerlinger, Fred N. Foundations of behavioral research / Fred N. Kerlinger. - 4th ed. - Australia: Cengage Learning, 1992. - xxv, 890 p. ill. 23 cm. ISBN: 9780155078970 0155078976 Subjects--Topical Terms: KnowledgeResearch Methods Dewey Class. No.: 001.42 / KER