The Science of Self-Confidence by Brian Tracy Complete 6 cassette complette set. Set is a self-improvement audio program aimed at young adults and adults. Published in 1991 by Nightingale Conant, this nonfiction set explores the topic of self-confidence. With a total of 6 cassettes included in the set. These cassette tapes are for those looking to enhance their self-confidence. The case has cracks but the tapes are in good condition. Check pictures for details. Item number 1818
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