Drost, Pieter N., author
A.W. Sijthoff, 1951
Buku Teks
Betten, Lammy
Longman, 1998
Buku Teks
Selby, David, author
Cambridge University Press, 1988
Buku Teks
Vega, Connie de la, author
Edward Elgar, 2013
Buku Referensi
Vega, Connie de la, author
Edward Elgar Publishing, 2013
Buku Referensi