Boeke, J.H.
Institute of pacific relations, 1946
Buku Teks
Preger W.
F. W. Cheshire pty. ltd. , 1944
Buku Teks
Pieter Honig, Frans Verdoorn, edited
Board for the Netherlands Indies , 1945
Buku Referensi
Polak, J.J.
Netherlands and Netherlands Indies Council of the Institute of Pacific Relations , 1939
Buku Teks
Division of Commerce of the Department of Agriculture, Industry and Commerce, 1930
Buku Teks