APA

Koos L. V., Kefauver G. N., . (1937). Guidance in secondary schools. New York: Macmillan.

Chicago

Koos Leonard Vincent, Kefauver Grayson Neikirk, . 1937. Guidance in secondary schools. New York: Macmillan.

Harvard

Koos L. V., Kefauver G. N., . (1937). Guidance in secondary schools. New York: Macmillan.

MLA

Koos Leonard Vincent, Kefauver Grayson Neikirk, . Guidance in secondary schools. New York: Macmillan. 1937.