APA (7th ed.) Citation

Barr, A. S. (1931). An introduction to the scientific study of classroom supervision. D. Appleton and company.

Chicago Style (17th ed.) Citation

Barr, A. S. An Introduction to the Scientific Study of Classroom Supervision. New York, London: D. Appleton and company, 1931.

MLA (9th ed.) Citation

Barr, A. S. An Introduction to the Scientific Study of Classroom Supervision. D. Appleton and company, 1931.