Zeller, Eduard, 1814-1908
Outlines of the history of Greek philosophy
Meridian Books, 1960
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Burnet, John
Early Greek philosophy
Meridian Books, 1957
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Philosophers speak for themselves: From Aristotle to Plotinus
edited by Thomas Vernor Smith
University of Chicago Press, 1956
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Kirk, G.S. [Geoffrey Stephen], 1921-
The presocratic philosophers : a critical history with a selection of texts
Cambridge University Press, 1957
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Armstrong, A.H.
An introduction to ancient philosophy
Newman Press, 1949
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