也許更便宜
- The 80/20 Manager
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- El lider 80/20 / The 80/20 Manager
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- The Chemist and Druggist [electronic Resource]; Vol. 80, no. 20 = no. 1686 (18 May 1912)
- NTD$591
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- 80-20 Principle: The Secret to Success by Achieving More with Less 80/20法則
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