Plato
The Republic
Everyman's Library , 1992
 Buku Teks
Plato
The Republic
Pinguin Books, 1960
 Buku Teks
Radhakrishnan, Sarvepalli, 1888-1975
Indian philosophy
Macmillan, 1958
 Buku Teks
Radhakrishnan, Sarvepalli, 1888-1975
Indian philosophy
George Allen and Unwin, 1930
 Buku Teks
Fletcher, Sydney E.
The American Indian
Grosset & Dunlap, 1954
 Buku Teks