APA (7th ed.) Citation

Harnack, R. V., Fest, T. B., & Jones, B. S. (1977). Group discussion: Theory and technique (2d ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Harnack, Robert Victor, Thorrel B. Fest, and Barbara S. Jones. Group Discussion: Theory and Technique. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1977.

MLA (9th ed.) Citation

Harnack, Robert Victor, et al. Group Discussion: Theory and Technique. 2d ed. Prentice-Hall, 1977.