Stumpf, S. E. (1999). Socrates to Sartre: A history of philosophy (6th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Stumpf, Samuel Enoch. Socrates to Sartre: A History of Philosophy. 6th ed. Boston, Mass: McGraw-Hill, 1999.
Lua MLA (9ú heag.)Stumpf, Samuel Enoch. Socrates to Sartre: A History of Philosophy. 6th ed. McGraw-Hill, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.