- Aitchison (1933). "A Collection of Treaties, Engagements, and Sunnuds relating to India and Neighbouring Countries", ed. by C.U. Aitchison (Calcutta: Re-printed at the Foreign Office Press, 1876), 7 vols. (web site)
- Bhacker (1992). "Trade and Empire in Muscat and Zanzibar: Roots of British Domination", by M. Reda Bhacker (London: Routledge, 1992)
- British and Foreign State Papers (1841-1977). "British and Foreign State Papers" (London: various publishers, 1841-1977), 170 vols.