Lincoln the Unknown by US author Dale Carnegie
- The Chinese-language edition:《林肯传（戴尔·卡耐基/陶尚芸 译）》
- The original English version：GoodReads Link
Carnegie also explores Lincoln’s values and character—his honesty, empathy, and unyielding belief in the unity of the nation. The book goes beyond the political history and offers a glimpse into Lincoln’s moral compass, showing how his principles guided his decisions in moments of extreme pressure.