Strayer, G. D., & Engelhardt, N. L. (1920). The classroom teacher at work in American schools. American Book company.
Lua i Stíl Chicago (17ú heag.)Strayer, George Drayton, agus N. L. Engelhardt. The Classroom Teacher at Work in American Schools. New York: American Book company, 1920.
Lua MLA (8ú heag.)Strayer, George Drayton, agus N. L. Engelhardt. The Classroom Teacher at Work in American Schools. American Book company, 1920.
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