Ashbourne, A.P. (1875) Improvement in processes of treating cocoa-nut. Specification forming part of Letters Patent No. 194,287 United States Patent Office.

Grant, J.A. (1872/75) Addendum to the botany of the Speke & Grant Expedition. Trans. Linn. Soc 29, Part 1, 187-188. [Abundant in Zanzibar in 1860 but after a hurricane in 1872 majority destroyed. Few on east coast mainland but none in the interior].