APA (7th ed.) Citation

Harnack, R. V., & Fest, T. B. (1964). Group discussion: Theory and technique. Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Harnack, Robert Victor, and Thorrel Brooks Fest. Group Discussion: Theory and Technique. New York: Appleton-Century-Crofts, 1964.

MLA (9th ed.) Citation

Harnack, Robert Victor, and Thorrel Brooks Fest. Group Discussion: Theory and Technique. Appleton-Century-Crofts, 1964.