A few examples of reference books below:
Cambridge Handbook of Sociocultural Psychology by 
Cambridge Handbook of Consciousness by 
Cambridge Handbook of Acculturation Psychology by 
Handbook of the Sociology of Emotions by 
Handbook of Girls' and Women's Psychological Health by 
International Handbook of Creativity by 
Cambridge Handbook of Age and Ageing by 
Cambridge Handbook of Thinking and Reasoning by 
The Corsini Encyclopedia of Psychology and Behavioral Science by 
Psychology Basics
Encyclopedia of Social and Cultural Anthropology
The Cambridge Encyclopedia of Child Development by 
Sport Psychology: The Key Concepts by 
The Oxford Companion to the Mind by 
Sex in the Ancient World From A to Z by An example of free ebooks from National Academies Press.
The Concise Dictionary of Psychology by 
Dictionary of Theories, Laws, and Concepts in Psychology by 
