Bridson (De Wild.) 1986 - Bridson DM (1986) The Reinstatement of the African Genus Keetia (Rubiaceae subfam. Cinchonoideae, Tribe Vanguerieae). Kew Bulletin 41(4): 965-994. doi: 10.2307/4102996.
There is no corrections for Keetia zanzibarica subsp. gentilii yet.