York University
Classics in the History of Psychology: Intergroup Conflict and Cooperation
This is the Robbers Cave Experiment. This experiment focused on intergroup relations, mostly negative attitudes toward the out group.
Khan Academy
Khan Academy: Test Prep: Mcat: Behavior: Motivation and Attitudes: Motivation Article
Explains the basic theories of motivation.
National Institutes of Health
National Center for Biotechnology Information: Stigma in Psychiatry
Addresses the issue of stigmatization of mental health disorders, its roots, attitudes of public and professionals, the impact of stigma, and efforts to combat stigmatization.