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 B. Fest. Group Discussion; Theory and Technique. New York: Appleton-Century-Crofts, 1964.

MLA (8th ed.) Citation

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