Ministry of Foreign Affairs The Netherlands, 2004
Buku Referensi
Ministry of Foreign Affairs Netherlands, Communication Division (DVL/VB) ,
Buku Teks
Amsterdam University Press, 2011
Buku Teks
Schoffer, Ivo, author
Allert de Lange, 1973
Buku Teks
edited by P.E. de. Josselin de Jong and Erik Schwimmer
Martinus Nijhoff, 1982
Buku Teks