APA

Risk T. M., . (1958). Principles and practices of teaching in secondary schools. New York: American Book Co.

Chicago

Risk Thomas Marion, . 1958. Principles and practices of teaching in secondary schools. New York: American Book Co.

Harvard

Risk T. M., . (1958). Principles and practices of teaching in secondary schools. New York: American Book Co.

MLA

Risk Thomas Marion, . Principles and practices of teaching in secondary schools. New York: American Book Co. 1958.