Henderson, William, author
The MIT Press, 1963
Buku Teks
Fifield, Russell H., author
Praeger , 1963
Buku Teks
Brookings institution, 1949
Buku Teks
Brokings Institution, 1950
Buku Teks
Coedes, George, author
University of Malaya Press, 1968
Buku Teks