Baumann, O. (1897) Sansibar - Archipel, 2. Heft: die Insel Sansibar und ihre kleineren Nachbarinseln, Denker und Humbold, Leipzig 1897.

Ferguson, J (1897) All about the “Cocoanut Palm.” Including practical instructions for planting and cultivation ... Second edition. A. M. & J. Ferguson: Colombo, 1897. 8o.

McCrindle, J.W. (1897) The Christian Topography of Cosmas, an Egyptian Monk (London, 1897). Also see an edition with geographical notes, entitled The Christian Topography of Cosmas Indicopleustes, by E. O. Winstedt (Cambridge, 1909).

Semler, H. (1897) Die Tropische Agrikultur, 2 Aufl. 1 Bd. p629.