The world of ideas: essays for study. (1966). The world of ideas: Essays for study. New York: Holt, Rinehart and Winston.
Čikaški stil citiranjaThe world of ideas: essays for study. The World of Ideas: Essays for Study. New York: Holt, Rinehart and Winston, 1966.
MLA način citiranjaThe world of ideas: essays for study. The World of Ideas: Essays for Study. New York: Holt, Rinehart and Winston, 1966.
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