APA (7th ed.) Citation

Hoffman, L. R. (1979). The Group problem solving process: Studies of a valence model. Praeger.

Chicago Style (17th ed.) Citation

Hoffman, L. Richard. The Group Problem Solving Process: Studies of a Valence Model. New York: Praeger, 1979.

MLA (9th ed.) Citation

Hoffman, L. Richard. The Group Problem Solving Process: Studies of a Valence Model. Praeger, 1979.