Patrick, George Thomas White
Introduction to philosophy
George Allen and Unwin, 1925
 Buku Teks SO
Brightman, Edgar Sheffield
An Introduction to philosophy
Holt, Rinehart and Winston, 1961
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Randall, John Herman
Philosophy : an introduction
Barnes & Noble, 1957
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Zeller, Eduard, 1814-1908
Outlines of the history of Greek philosophy
Meridian Books, 1960
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Gomperz, Theodor
Greek thinkers a history of ancient philosophy
John Murray , 1955
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