Christian, J. L. (1986). Philosophy: An introduction to introduction to the art of wondering. Holt, Rinehart and Winston.
Chicago-viite (17. p.)Christian, James L. Philosophy: An Introduction to Introduction to the Art of Wondering. Holt, Rinehart and Winston, 1986.
MLA-viite (9. p.)Christian, James L. Philosophy: An Introduction to Introduction to the Art of Wondering. Holt, Rinehart and Winston, 1986.
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