The Definitive Book of Body Language (2004) by body language experts Allan and Barbara Pease is a comprehensive guide to non-verbal communication. An expanded version of Allen Pease’s Body Language (1981), The Definitive Book of Body Language outlines the basics of body language, including expressions, gestures, and physical movements, and offers supporting scientific data to explain what body language telegraphs in everyday exchanges...
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(Disclaimer: This is NOT the original book. If you’re looking for the original book, it is available from Amazon.)