Reference books or Encyclopaedias provide quick insight on a topic and helps to provide a broader view of the topic. Their Dewey numbers correlate with their open shelf partners, but have an R preceding the Dewey number. You will also find quite a number of Dictionaries on your subject field among the Reference Books.
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Some examples are:
R150.1519503 ENC Encyclopedia of statistics in behavioral science / editors-in-chief, Brian S. Everitt, David C. Howell.
R150.19 ENC Encyclopedia of positive psychology / edited by Shane J. Lopez.
R150.19 ENC The encyclopedia of positive psychology / edited by Shane J. Lopez.
R150.1952 FRE The Freud encyclopedia : theory, therapy, and culture / Edward Erwin, editor.
R150.1954 JUN The red book = Liber novus / C.G. Jung edited by Sonu Shamdasani preface by Ulrich Hoerni translated by Mark Kyburz, John Peck, and Sonu Shamdasani.
R150.3 APA APA dictionary of psychology / Gary R. VandenBos, editor in chief.
R150.3 CAM The Cambridge dictionary of psychology / general editor, David Matsumoto.
R150.3 COL A dictionary of psychology / Andrew M. Colman.
R150.3 COR The Corsini encyclopedia of psychology / edited by Irving B. Weiner, W. Edward Craighead.
R150.3 ENC Encyclopaedic dictionary of psychology / Graham Davey.
R150.3 MUL Multilingual glossary of psychology terms / [translation by Words & CO. Language Services project editor, Tashne Singh].
R150.3 REB The Penguin dictionary of psychology / Arthur S. Reber and Emily S. Reber.
R150.3 RIC Psychology : the key concepts / Graham Richards.
R153.03 ENC Encyclopedia of consciousness / editor-in-chief, William P. Banks.
R153.03 MIT The MIT encyclopedia of the cognitive sciences / edited by Robert A. Wilson and Frank C. Keil.
R153.35 ENC Encyclopedia of creativity / editors-in-chief, Mark A. Runco, Steven R. Pritzker.
R153.4303 WAR Thinking from A to Z / Nigel Warburton.
R153.703 ENC Encyclopedia of perception / [edited by] E. Bruce Goldstein.
R155.26 HUS Making a difference by being yourself : using your personality type at work and in relationships / Gregory E. Huszczo.
R155.82 ENC Encyclopedia of multicultural psychology / edited by Yo Jackson.
R616.8003 LEX Lexicon of psychiatry, neurology, and the neurosciences / editor, Frank J. Ayd, Jr.
R616.8303 ENC Encyclopedia of movement disorders / editors-in-chief, Leo Verhagen Metman and Katie Kompoliti.
R616.89075 DIA Diagnostic and statistical manual of mental disorders : DSM-IV-TR.
R616.89075 DIA Diagnostic criteria from DSM-IV-TR / American Psychiatric Association.
R616.891403 ENC Encyclopedia of psychotherapy / editors-in-chief, Michel Hersen, William Sledge.
R616.9792 HUB Encyclopedic dictionary of AIDS-related terminology / Jeffrey T. Huber, Mary L. Gillaspy.
R616.98003 ENC Encyclopedia of stress / editor-in-chief, George Fink.
