Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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