Waterson, D.B.
Sydney University Press, 1968
Buku Teks
Vohra, D.B.
New Delhi Munshiram Anoharlal 1992,
Buku Teks
Waterson, Roxana
Roxana Waterson, 1997
Buku Referensi
Towers, T.D., author
Tab Books,, 1977
Buku Teks
Downs, Hunton
Bantam Books, 1973
Buku Teks