ビジネスマン必勝講座 ヤクザに学ぶ 経済戦術
What are the 'negotiation tactics' learned from the yakuza other than fighting and blackmail??? The negotiation skills of the yakuza, honed to the extreme, are now revealed!!
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ビジネスマン必勝講座 ヤクザに学ぶ 経済戦術 2007
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