หนังสือจาก Sigmund Foster

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  Manipulation and Dark Psychology: Understand Dark Psychology Secrets and Read Body Language to Identify a Narcissist. Learn Body Language, How to Read People and Analyze OthersJohn Mind
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  NLP Dark Psychology: NLP Guide to Identify Dark Psychology Art. Use NLP Manipulation for Reading People and Their PersonalitySigmund Foster

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  Dark Persuasion: The Ultimate Guide to Understand NLP Persuasion Psychology, Practice Dark Psychology and the Art of Manipulation to Defend OneselfSigmund Foster