APA (7th ed.) Citation

Simon, H. W., & Flexner, A. (1938). Preface to teaching. Oxford University Press.

Chicago Style (17th ed.) Citation

Simon, Henry William, and Abraham Flexner. Preface to Teaching. New York, London: Oxford University Press, 1938.

MLA (9th ed.) Citation

Simon, Henry William, and Abraham Flexner. Preface to Teaching. Oxford University Press, 1938.