APA
Gregory R. J., . (2008). Psychological testing : history principles and applications 4th ed. Delhi: Pearson Education.
Chicago
Gregory Robert J, . 2008. Psychological testing : history principles and applications 4th ed. Delhi: Pearson Education.
Harvard
Gregory R. J., . (2008). Psychological testing : history principles and applications 4th ed. Delhi: Pearson Education.
MLA
Gregory Robert J, . Psychological testing : history principles and applications 4th ed. Delhi: Pearson Education. 2008.