Roze, Maris, author
Houghton Miffiln, 1980
Buku Teks
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