Geldern, I. Van
BIJ J. B. Wolters U. M., [date of publication not identified]
Buku Referensi
Gallas, K. R.
J. B. Wolters, [date of publication not identified]
Buku Referensi
Herckenrath, C. R. C.
J. B. Wolters U. M., [date of publication not identified]
Buku Referensi
Wageningen, J. Van
J. B. Wolters U. M., 1921
Buku Referensi
Muller J.Z.N., F.
Groningen J.B. Walters 1919
Buku Referensi