You can get general background on psychological concepts and theories from the following encyclopedias.
Corsini Encyclopedia of Psychology (4th ed., 2010, 4 vols.)
Corsini Encyclopedia of Psychology and Behavioral Sciences, 4 vols (2001).
An updated (2010) and highly regarded print edition is available in Waldo Library's Reference collection at: BF31. E52 2010.
2nd ed., 2012, "covering all aspects of human behavior. Composed of essays that are self-contained summaries of one aspect of human behavior--written by eminent scholars and peer-reviewed. BF31 .E5 1994 (Education Library, Reference Collection, Sangren Hall)
Practical, non-technical articles on statistical concepts and techniques.
This is available online in full text from 1950 to the present.
Diagnostic and Statistical Manual of Mental Disorders: DSM-V.
Includes DSM-V (the Diagnostic and Statistical Manual of Mental Disorders, 5th edition), the standard classification of mental disorders used by mental health professionals, clinicians and researchers in the United States. Part of Psychiatry Online which also provides Journals, Textbooks, Self Assessments, Diagnosis, Treatments, casebooks and complete access to the DSM, 4th edition, including revisions.
Handbook of International Psychology
BF121 .H2115 2004 (Waldo, Reference)
Handbook of Psychological Assessment
BF176 .G76 2009 (Waldo, General Stacks)
Handbook of Psychology (2003, 12 vols.)
BF121 .H1955 2003, (Waldo, Reference)
Content is also available online through Library Search. Search for individual titles, and access from the individual volume links, e.g., Vol. 10 on Assessment Psychology.
Contains overviews, descriptions and one or more reviews of many English-language standardized tests of educational skills, personality, psychological traits, and related areas.
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Stevens' Handbook of Experimental Psychology
BF181 .H336 2002 (Waldo, Reference)