1. and , Kenya Trees and Shrubs, p. 75. Buchanan's Kenya Estates Ltd, Nairobi (1961).
2. Frankincense and myrrh
3. and , Kora: An Ecological Inventory of the Kora National Reserve, Kenya, ed. and , p. 107, Royal Geographical Society, London (1986).
4. Isiands in the Bush, George Philip, London (1985). Two plates show resin from Commiphora africana (p. 39) —one is erroneously attributed to Boswellia neglecta.
5. Kora: An Ecological Inventory of the Kora National Reserve, Kenya, ed. and , p. 137, Royal Geographical Society, London (1986).