Cita APA (7a ed.)

Seligman, M. E. P. (1992). Learned optimism. Pocket Books.

Cita Chicago Style (17a ed.)

Seligman, Martin E. P. Learned Optimism. New York [etc.]: Pocket Books, 1992.

Cita MLA (9a ed.)

Seligman, Martin E. P. Learned Optimism. Pocket Books, 1992.