Palmer, G. H. (1919). Altruism: Its nature and varieties. The Ely lectures.
Cita Chicago Style (17a ed.)Palmer, George Herbert. "Altruism: Its Nature and Varieties." The Ely Lectures 1919.
Cita MLA (8a ed.)Palmer, George Herbert. "Altruism: Its Nature and Varieties." The Ely Lectures, 1919.
Precaución: Estas citas no son 100% exactas.