Chakravarti, S.N.
Order Of The Trustees, 1950
Buku Teks
Childe, V. Gordon, author
Routledge, 1996
Buku Teks
Toynbee, Arnold J., author
Kodansha International, 1976
Buku Teks
Wendt, Herbert, author
Houghton-Mifflin, 1956
Buku Teks
Pfeiffer, John E., author
Harper & Row, 1969
Buku Teks