APA (7th ed.) Citation

Freud, S., Zweig, A., & Freud, E. L. (1987). The letters of Sigmund Freud and Arnold Zweig. New York University Press.

Chicago Style (17th ed.) Citation

Freud, Sigmund, Arnold Zweig, and Ernst L. Freud. The Letters of Sigmund Freud and Arnold Zweig. New York: New York University Press, 1987.

MLA (9th ed.) Citation

Freud, Sigmund, et al. The Letters of Sigmund Freud and Arnold Zweig. New York University Press, 1987.