Current issues and enduring questions: methods and models of argument from Plato to the present
edited by Sylvan Barnet and Hugo A. Bedau
A Bedford Book, 1987
 Buku Teks SO
Corvi, Roberta
An introduction to the thought of karl popper/Roberta Corvi
Routledge, 1997
 Buku Teks
Great books of the western world : 7 Plato
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
 Buku Referensi
Plato's republic / introduction by A.A. Linday
E.P.Dutton, 1954
 Buku Teks
Robenso, James Harvey
Medievel and modern times : an introduction to the history of Western civilization from...
Ginn , 1931
 Buku Teks SO