(1949). Pursuit of happiness: A primer for modern living. Spero Foundation.
Chicago-Zitierstil (17. Ausg.)Pursuit of Happiness: A Primer for Modern Living. New York: Spero Foundation, 1949.
MLA-Zitierstil (8. Ausg.)Pursuit of Happiness: A Primer for Modern Living. Spero Foundation, 1949.
警告：这些引文格式不一定是100％准确.