Keulen, Mensje van, author
de Arbeiderspers, [Date of publication not identified]
Buku Teks
Deelder, J.A., author
Bezige, 1990
Buku Teks
Kramers, Johannes Hendrik, author
[publisher not identified], [date of publication not identified]
Buku Klasik
Heleen Kernkamp-Biegel ... [and others]
Wolters-Noordhoff, [date of publication not identified]
Buku Teks
Grollenberg, L.H., author
Amsterdam Elsevier 1955
Buku Referensi