APA-Zitierstil (7. Ausg.)

Wrinkle, W. L., & Armentrout, W. D. (1935). Directed Observation and teaching in secondary schools ((Repr.).). Macmillan Co.

Chicago-Zitierstil (17. Ausg.)

Wrinkle, William Lawrence, und Winfield D. Armentrout. Directed Observation and Teaching in Secondary Schools. (Repr.). New York: Macmillan Co, 1935.

MLA-Zitierstil (9. Ausg.)

Wrinkle, William Lawrence, und Winfield D. Armentrout. Directed Observation and Teaching in Secondary Schools. (Repr.). Macmillan Co, 1935.