title={{The sources of innovation}}, author={von Hippel, E.}, isbn={0195094220}, year={1988}, publisher={Oxford University Press}
title={{The sources of innovation}}, author={von Hippel, E.}, isbn={0195094220}, year={1988}, publisher={Oxford University Press}, note ={(榊原清則訳, イノベーションの源泉, ダイヤモンド社 (1991))}