Pernis, H. D. van, author
J. B. Wolter, 1950
Buku Referensi
Vries, Jan de, author
Het Spectrum, 1991
Buku Teks
Bruggencate, K. Ten, author
J.B. Wolters-Groningen, [Date of publication not identified]
Buku Referensi
Geldern, I. Van, author
BIJ J. B. Wolters U. M., [date of publication not identified]
Buku Referensi
Gallas, K. R., author
J. B. Wolters, [date of publication not identified]
Buku Referensi