APA (7th ed.) Citation

Seligman, M. E. (1990). Learned optimism. Pocket bks..

Chicago Style (17th ed.) Citation

Seligman, Martin E.P. Learned Optimism. New York: Pocket bks., 1990.

MLA (9th ed.) Citation

Seligman, Martin E.P. Learned Optimism. Pocket bks., 1990.