Cohen, Elizabeth G.  Designing Groupwork: Strategies for the Heterogeneous Classroom.  New York: Teachers College, 1994.
    This book combines easy to follow theory with examples and teaching strategies that are adaptable to any
    situation.  The advantages and dilemmas of groupwork are discussed, as well as its use in multiability and
    bilingual classrooms. Also included are step-by-step approaches to successful planning, implementation, and
    evaluation of groupwork activities.

Johnson, David W., Roger T. Johnson, Edythe Johnson Holubec, Patricia Roy. Circles of Learning: Cooperation in the Classroom.  Alexandria, VA: Asssociation for Supervision and Curriculum Development, 1984.
    Chapters on: why cooperative learning is important; relevance of research on cooperative learning;
    implementing cooperative learning; teaching students cooperative skills; supervising teachers' use of
    cooperative learning; myth about cooperative learning; reflections.