Ries, A. (1996). Focus: The feature of your company depends on it. Harper Collins Publishers.
シカゴスタイル引用形Ries, AI. Focus: The Feature of Your Company Depends on It. New York: Harper Collins Publishers, 1996.
MLA引用形式Ries, AI. Focus: The Feature of Your Company Depends on It. Harper Collins Publishers, 1996.
警告: この引用は必ずしも正確ではありません.