| Book reference is to: Martin E.P. Seligman, Ph.D., Learned Optimism: How to Change Your Mind and Your Life (New York: A. A. Knopf, 1991; and New York: Pocket Books, 1992). |
| Book reference is to: Martin E.P. Seligman, Ph.D., Learned Optimism: How to Change Your Mind and Your Life (New York: A. A. Knopf, 1991; and New York: Pocket Books, 1992). |