Ellen S. Berscheid & Pamela C. Regan 
Psychology of Interpersonal Relationships [PDF ebook] 

This textbook provides an integrated and organized foundation for students seeking a brief but comprehensive introduction to the field of relationship science. It emphasizes the relationship field’s intellectual themes, roots, and milestones; discusses its key constructs and their conceptualizations; describes its methodologies and classic studies; and, most important, presents the theories that have guided relationship scholars and produced the field’s major research themes.