Santayana. The Life of Reason or The Phases of Human Progress. The MIT Press.
Chicago Style (17th ed.) CitationSantayana. The Life of Reason or The Phases of Human Progress. The MIT Press.
MLA引文Santayana. The Life of Reason or The Phases of Human Progress. The MIT Press.
警告：這些引文格式不一定是100％准確.