Esser, B.J., author
G. Kolff, [date of publication not identified]
Buku Klasik
Walbeehm, A.H.J.G., author
[publisher not identified], [date of publication not identified]
Buku Klasik
Esser, B.J., author
Weltevreden: Kolff & Co, [T.tp]
Buku Teks
Walbeehm, A.H.J.G., author
Albrecht, 1903
Buku Klasik
Stijnen, Sjef
Staatsuitgeverij, 1981
Buku Teks