Cita APA (7a ed.)

Heap, K. (1979). Process and action in work with groups: The preconditions for treatment and growth. Pergamon Press.

Cita Chicago Style (17a ed.)

Heap, Ken. Process and Action in Work with Groups: The Preconditions for Treatment and Growth. Oxford [England] ; New York: Pergamon Press, 1979.

Cita MLA (8a ed.)

Heap, Ken. Process and Action in Work with Groups: The Preconditions for Treatment and Growth. Pergamon Press, 1979.