From The Greats
プロフェッショナルマネジャー
Documented citation: Tadashi Yanai identifies the original Professional Manager as the book from which he learned the most about management and describes its impact on his own work.
Documented citation · Recommended
Open source
Evidence details
柳井 正:プロマネ・ノートはこう読んでほしい！This source documents the book relationship, but the displayed text is a catalog summary rather than a verbatim quote.
PRESIDENT / PRESIDENT Books · 2011-01-23 · accessed 2026-10-01
article · Signed reading endorsement
Signed winter2010 piece, published2011-01-23. Separate explicit endorsement names original Professional Manager as lifetime most-learned book. Reader instruction about Notes adaptation is not transferred to original.