Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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