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- Language: German
- Year: 2012

- Author: Thomas Gordon
- Language: German
- Year: 2012

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- Year: 2013

Leader effectiveness training, L.E.T: The no-lose way to release the productive potential of people
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- Language: English
- Year: 1977

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- Year: 2005

- Author: Thomas Gordon
- Language: French
- Year: 2003

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- Year: 2007

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- Language: German
- Year: 1989

- Author: Thomas Gordon
- Language: English
- Year: 2001