Woolley, Leonard
Penguin Books , 1965
Buku Teks
Dani, A.H.
Centre for East Asian Cultural Studies ; Paris, France : United Nations Educational, Scientific and Cultural Organization, 1988.
Buku Teks
Gifford, E. W.
University of California Press, 1956
Buku Teks
Brion, Marcel, 1895-1984
Macmillan, 1961
Buku Teks
Thapar, B.K.
Unesco, 1985
Buku Teks