Cita APA

Hoppock, R. n. 1., & Hoppock, R. n. 1. (1949). Group guidance: Principles, techniques and evaluation. New York, New York: McGraw-Hill.

Citación estilo Chicago

Hoppock, Robert n. 1901, y Robert n. 1901 Hoppock. Group Guidance: Principles, Techniques and Evaluation. New York, New York: McGraw-Hill, 1949.

Cita MLA

Hoppock, Robert n. 1901, y Robert n. 1901 Hoppock. Group Guidance: Principles, Techniques and Evaluation. New York, New York: McGraw-Hill, 1949.