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Understanding research methods for the behavioral sciences/

Singapore: Cengage Learning, 2012 . 564 pages: , Includes bibliographical references, glossary and index. 23 cm.. 9789814352369

By Gravetter, Frederick J.. Taguig City, Philippines : Cengage Learning (Philippine branch), 2019 . xix, 732 pages : 25 cm.. 9789814846233

By "Gravetter, Frederick J.". 1991

By "Frederick, J.". 1995