Seligman, M. E. (1990). Learned optimism. Pocket bks..
Chicago-čujuhus (17. p.)Seligman, Martin E.P. Learned Optimism. New York: Pocket bks., 1990.
MLA-čujuhus (9. p.)Seligman, Martin E.P. Learned Optimism. Pocket bks., 1990.
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