"Emigration: Colonial circuits between Europe and Asia in the 19th and early 20th century", European History Online, Mainz: Institute of European History, 2011, retrieved: 23 May 2011.
* Индонезия* Португальская Индонезия* Индонезия в БСЭ* Bosma, Ulbe: ‘’Emigration: Colonial circuits between Europe and Asia in the 19th and early 20th century’’, EGO - Europäische Geschichte Online Майнц: Institute of European History, 2011, проверено 18 мая 2011.