Wightman, W.P D.
Oliver and Boyd, 1962
Buku Teks
Wallerstein, Immanuel, author
Academic Press, 1974
Buku Teks
Sudjoko, author
Proyek Penelitian Purbakala, 1981
Buku Teks
Hill, Bridget
UCL Press , 1994
Buku Teks
Wilding, Michael, author
Routledge & Kegan Paul, 1980
Buku Teks