Zanzibar: Sources

Aitchison Treaties Collection. A Collection of Treaties, Engagements, and Sunnuds relating to India and Neighbouring Countries: Compiled by C. U. Aitchison, B.C.S., Under-Secretary to the Government of India in the Foreign Department. Calcutta: Re-printed at the Foreign Office Press, 1876. 7 vols. online
Bhacker (1992). Bhacker, M. Reda. Trade and Empire in Muscat and Zanzibar: Roots of British Domination. London: Routledge, 1992.
British and Foreign State Papers. British and Foreign State Papers. London, 1841-1977. 170 vols. online
Hollingsworth (1975). Hollingsworth, Lawrence William. Zanzibar under the Foreign Office, 1890-1913. Westport, CT: Greenwood Press, 1975. online
Zanzibar Gazette. The Gazette for Zanzibar and East Africa (No. 1, 1 Feb 1892 - No. 899, 21 Apr 1909) || The Gazette for Zanzibar (No. 900, 28 Apr 1909 - No. 1,144, 1913) || The Official Gazette of the Zanzibar Government (1913 - No. 4333, 25 Jan 1964) || Gazeti Rasmi la Serikali Zanzibar (25 Jan 1964 - 9 Jun 1978) || Gazeti Rasmi la Serikali ya Tanzania-Zanzibar (10 Jun 1978-)