Wikipedia is a great resource for getting general info about something, but because anyone can contribute or change its content, it is sometimes considered unreliable. It is a good place to start your research, but it is best to double check what you find against other sources.
Encyclopedia of Diversity and Social Justice
Encyclopedia of Race and Racism
Reference resources (encyclopedias, dictionaries, etc.) can provide a general overview of a topic and help identify synonyms, related terms, or basic data; these sources often include references and lists of further readings. Additionally, these resources have typically gone through an editorial process to check for accuracy.
Race and Racism in the United States: an encyclopedia of the American mosaic
Black Power Encyclopedia: from "Black is beautiful" to urban uprisings
Social Issues in Living Color: challenges and solutions from the perspective of ethnic minority psychology
International encyclopedia of the social & behavioral sciences
The Wiley Blackwell Encyclopedia of Social and Political Movements
Misogyny in American Culture: causes, trends, and solutions
Disability in American Life: an encyclopedia of concepts, policies, and controversies