[프로그래머, 폴 그레이엄의] How to Disagree

자료 1: http://www.paulgraham.com/disagree.html (Paul Graham, http://www.paulgraham.com/)
자료 2: https://en.wikipedia.org/wiki/Paul_Graham_(computer_programmer)#cite_note-22


※ 발췌(excerpt): Graham's hierarchy of disagreement