James A. Gould. (1982). Classic philosophical questions (4th ed.). Merrill.
Cita Chicago (17th ed.)James A. Gould. Classic Philosophical Questions. 4th ed. Columbus, Ohio: Merrill, 1982.
Cita MLA (9th ed.)James A. Gould. Classic Philosophical Questions. 4th ed. Merrill, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.