APA (7th ed.) Citation

Freud, S., & Freud, E. L. (1960). Letters. McGraw-Hill.

Chicago Style (17th ed.) Citation

Freud, Sigmund, and Ernst L. Freud. Letters. New York: McGraw-Hill, 1960.

MLA (9th ed.) Citation

Freud, Sigmund, and Ernst L. Freud. Letters. McGraw-Hill, 1960.