APA (American Psychological Association) style is one of the common citation styles for referencing:
Publication Manual of the American Psychological Association by 
Dictionary of Hong Kong Sign Language: A Trilingual Dictionary with Linguistic Descriptions = 香港手語詞典 by Gladys Tang (Editor)
A dictionary of social research methods
Dictionary of Social Work by 
A Dictionary of Social Work and Social Care by 
Encyclopedia of Social and Political Movements by 
The Encyclopedia of Social Work
Encyclopedia of Social Psychology by 
The Greenwood Encyclopedia of Children's Issues Worldwide by 
The SAGE Encyclopedia of Marriage, Family and Couples Counseling by 
The Social Worker's Guide to the Social Sciences: The Key Concepts by 
Social work essentials : selections from the Encyclopedia of social work by 
Encyclopedia of Couple and Family Therapy by 
The Encyclopedia of Child and Adolescent Development by 
