DICTIONARIES

Concise dictionary of psychology
Dictionary of theories, laws and concepts in psychology
Dictionary of psychology
Experimental design: A handbook and dictionary for medical and behavioral research
Historical dictionary of quotations in cognitive science: A treasury of quotations in psychology, philosophy, and artificial intelligence
Online dictionary of mental health
Psychology Dictionary & Glossary for students : ITS Tutorial School's comprehensive source of definitions for Psychology and Mental Health related terms.
University of Alberta's Dictionary of Cognitive Science

ENCYCLOPEDIAS

Blackwell encyclopedia of social psychology
Corsini encyclopedia of psychology and behavioral science 
Encyclopedia of adult development
Encyclopedia of applied psychology
Encyclopedia of forensic sciences
Encyclopedia of psychology
Gale encyclopedia of psychology
Historical encyclopedia of school psychology
Oxford companion to the mind