APA (7th ed.) Citation

Strayer, G. D., & Engelhardt, N. L. (1920). The classroom teacher at work in American schools. American Book Company.

Chicago Style (17th ed.) Citation

Strayer, George D., and N. L. Engelhardt. The Classroom Teacher at Work in American Schools. New York: American Book Company, 1920.

MLA (9th ed.) Citation

Strayer, George D., and N. L. Engelhardt. The Classroom Teacher at Work in American Schools. American Book Company, 1920.