សៀវភៅ ៣ក្បាល ដែលអាចជួយបង្កើនទំនុកចិត្តក្នុងការនិយាយជាសាធារណៈ 1. "Talk Like TED" by Carmine Gallo Download 2. "The Quick and Easy Way to Effective Speaking" by Dale Carnegie Download 3. "Confessions of a Public Speaker" by Scott Berkun Download
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