Palmer, G. H. (1919). Altruism: Its nature and varieties. The Ely lectures.
芝加哥风格引文Palmer, George Herbert. "Altruism: Its Nature and Varieties." The Ely Lectures 1919.
MLA引文Palmer, George Herbert. "Altruism: Its Nature and Varieties." The Ely Lectures, 1919.
警告：这些引文格式不一定是100％准确.