APA (7th ed.) Citation

Seligman, M. E. P. (1991). Learned optimism (2. print.). Knopf.

Chicago Style (17th ed.) Citation

Seligman, Martin E. P. Learned Optimism. 2. print. New York: Knopf, 1991.

MLA (9th ed.) Citation

Seligman, Martin E. P. Learned Optimism. 2. print. Knopf, 1991.