CHRISTIAN, J. L. (1973). Philosophy: An introduction to the art of wondering. Rinehart Press.
Lua i Stíl Chicago (17ú heag.)CHRISTIAN, James L. Philosophy: An Introduction to the Art of Wondering. San Francisco: Rinehart Press, 1973.
Lua MLA (9ú heag.)CHRISTIAN, James L. Philosophy: An Introduction to the Art of Wondering. Rinehart Press, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.