APA (7th ed.) Citation

Risk, T. M. (1941). Principles and practices of teaching in secondary schools. American Book Co..

Chicago Style (17th ed.) Citation

Risk, Thomas Marion. Principles and Practices of Teaching in Secondary Schools. New York: American Book Co., 1941.

MLA (8th ed.) Citation

Risk, Thomas Marion. Principles and Practices of Teaching in Secondary Schools. American Book Co., 1941.