Vandersteen, Willy, author
Standaard, 2012
Buku Teks
Sharma, O.P., 1953-, author
McGraw Hill Publishing Company, 1986
Buku Teks
Algera, J.
Wolters-Noordhoff, 1984
Buku Teks
Elburg, Jan G.
Meulenhoff, 1988
Buku Teks
Ferguson, Margaretha, author
Nijgh & Van Ditmar, 1991
Buku Teks