The World of Ideas: essays for study
edited by Michael W. Alssid, William Kenney
Holt, Rinehart and Winston, 1964
 Buku Teks
The world of ideas: essays for study
edited by Michael W. Alssid and William Kenney
Holt, Rinehart and Winston, 1966
 Buku Teks
Berlin, Isaiah
Against the current: essays in the history of ideas
Viking Press, 1981
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Keith, Arthur Berriedale, 1879-1944
Essays on human evolution
Watts & Co., 1947
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The fundamental ideas of human rights in the thought of wonhyo
 Artikel Jurnal