APA (7th ed.) Citation

Freud, S., Strachey, J., & Richards, A. (1991). Introductory lectures on psychoanalysis. Penguin Books.

Chicago Style (17th ed.) Citation

Freud, Sigmund, James Strachey, and Angela Richards. Introductory Lectures on Psychoanalysis. London: Penguin Books, 1991.

MLA (9th ed.) Citation

Freud, Sigmund, et al. Introductory Lectures on Psychoanalysis. Penguin Books, 1991.