Gould, J. A. (1985). Classic philosophical questions (5th. ed.). Charles E. Merrill.
Cita Chicago (17th ed.)Gould, James A. Classic Philosophical Questions. 5th. ed. Charles E. Merrill, 1985.
Cita MLA (9th ed.)Gould, James A. Classic Philosophical Questions. 5th. ed. Charles E. Merrill, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.