Sykes, C.A. 1853. Notes on the possessions of the Imaun of Muskat, on the climate and productions of Zanzibar, and on the prospects of African discovery from Mombas. Journal of the Royal Geographical Society 23: 101-119.
Notes on the possessions of the Imaun of Muskat, on the climate and productions of Zanzibar, and on the prospects of African discovery from Mombas