APA (7th ed.) Citation

Gnagey, W. J. (1968). The psychology of discipline in the classroom. Macmillan.

Chicago Style (17th ed.) Citation

Gnagey, William J. The Psychology of Discipline in the Classroom. London: Macmillan, 1968.

MLA (9th ed.) Citation

Gnagey, William J. The Psychology of Discipline in the Classroom. Macmillan, 1968.