APA (7th ed.) Citation

Hoppock, R. (1949). Group guidance: Principles, techniques, and evaluation. McGraw-Hill Book Co..

Chicago Style (17th ed.) Citation

Hoppock, Robert. Group Guidance: Principles, Techniques, and Evaluation. New York: McGraw-Hill Book Co., 1949.

MLA (9th ed.) Citation

Hoppock, Robert. Group Guidance: Principles, Techniques, and Evaluation. McGraw-Hill Book Co., 1949.