Artikel Jurnal
Smith, J. N., author
'S Gravenhage; Albert Rusche & Co; M. Nijhoff, 1926
Buku Klasik
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
Hoppenbrouwers, Cornelis Antonius Johannes, author
Dick Coutinho, 1990
Buku Teks