Roorda, P.
Groningen Wolters 1919
Buku Teks
Termiorshuizen, Gerard, author
Jakarta , 1981
Buku Referensi
Muller, F.
Groningen J.B. Wolters 1939
Buku Referensi
Muller J.Z.N., F.
Groningen J.B. Walters 1919
Buku Referensi
Wely, F Prick van, author
London, Cassell
Buku Referensi