Allport, Gordon Willard, Kenneth Clark, and Thomas Pettigrew. 1954. “The nature of prejudice.”
This text, Gordon Allport’s “The Nature of Prejudice”, forms the bedrock of intergroup contact theory. The book introduces the concepts of prejudice and how it is formed between groups in conflict and argues that, if individuals had positive interactions with outgroup members who they were prejudice against, the negative feelings typically associated with the out-group would be reduced. This theory serves as one of the foundational methods for cultivating peace between conflicting groups with numerous related works of literature stemming from it.