1. January 31, 1874, recounted by the Russian Minister to the Dutch Minister, very secret letter of February 1, 1874, file Ra Moeilijkheden met Amerika, Netherlands Ministry oi Foreign Affairs, The Hague.
2. Singapore to Washington, Despatch No. 79, April 30, 1873, Despatches From Singapore, Vol. X, Dept. of State, National Archives, Washington, D.C.
3. Encl. “A” to Singapore Despatch No. 90, July 12, 1873, Singapore, Vol. X.
4. Washington to Singapore, Despatch No. 60, September 16, 1873, Despatches to Consuls, Vol. 70, pp. 290–292.
5. Netherlands Embassy London to The Hague, October 6 and 10, in file Ra III Stukken betreffende den Oorlog met Atjeh, Min. of Foreign Affairs; and Secret La L, Batavia to Singapore, November 22, 1873 in Ingekomen stukken, 1873, vol. 100, Netherlands Consulate Singapore, Min. of For. Affairs.