Gopal, Sarvepalli
Oxford University Press, 1979
Buku Teks
Gopal, Sarvepalli
Oxford University Press , 1984
Buku Teks
Fitzhardinge, L.F.
Angus & Robertson, 1979
Buku Teks
Treadwell, F.P.
John Wiley & Sons, 1963
Buku Teks
Raffles, Thomas Stamford
Oxford University Press, 1982
Buku Referensi