APA (7th ed.) Citation

Harnack, R. V., & Fest, T. B. (1964). Group Discussion: Theory and Technique. New York.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Harnack, R. Victor, and Thorrel B. Fest. Group Discussion: Theory and Technique. New York, 1964.