Knox, Robert, author
Ceylon Tisara Prakasakayo, 1966
Buku Teks
Ludowyk, E.F.C., author
Frederick A. Praeger, 1966
Buku Teks
Donaldson, Thomas
Prentice-Hall, 1981
Buku Teks
Henn, Harry, Alexander, John R
St.Paul,Minn : West publishing Co, 1983,
Buku Referensi
International cooperation Administration , [date of publication not identified]
Buku Teks