Wacks, Raymond
Blackstone Press limited, 1999
Buku Teks
Suri Ratnapala
Cambridge University Press, 2009
Buku Teks
Ratnapala, Suri, 1947-
Cambridge University Press, 2017
Buku Teks
Curzon, L.B.
Cavendish Publishing, 1992
Buku Teks
Jenks, Edward
John Murray, 1933
Buku Teks