Kaplan, Jeffrey P., author
Prentice Hall International, 1995
Buku Teks
Poutsma, H.
P. Noordhoff, 1922
Buku Teks
edited by Tim Storrie and James Matson
Cassell , 1991
Buku Teks
Makkink, H.J., author
Nijgh and Van Ditmar, 1951
Buku Teks
Newby, Michael, author
Cambridge University Press, 1988
Buku Teks