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- cooperation in the Singapore Indonesian border zone. IBRU. pp. 17–20. ISBN 1-897643-27-6. Retrieved 2010-06-15. "Riau Island Province". Government of Indonesia...46 KB (5,649 words) - 10:08, 10 January 2024
- International Boundaries Research Unit, illustrated, IBRU, 1997, ISBN 1-897643-27-6, ISBN 978-1-897643-27-3, pg. 6–10 Andaya (2001), p. 102 Borschberg,...184 KB (21,495 words) - 15:56, 15 May 2024