Coba jelasin Lihat juga dari Protokol Madrid 1885 dalam bahasa melayu dong

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Leigh R. Wright. The Origins of British Borneo. Modern Asian Studies, Vol. 10, No. 1 (1976), pp. 149–154

Leigh R. Wright. The Anglo-Spanish-German Treaty of 1885: A Step in the Development of British Hegemony in North Borneo. Australian Journal of Politics & History 18 (1), 62–75