APA

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

Chicago

Strayer George Drayton, Engelhardt Nickolaus Louis, . 1920. The classroom teacher at work in American schools. New York: American Book Company.

Harvard

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

MLA

Strayer George Drayton, Engelhardt Nickolaus Louis, . The classroom teacher at work in American schools. New York: American Book Company. 1920.