Martínez-Azorín, Mario, and Manuel B. Crespo. “Ethesia Tanquana (Ornithogaloideae, Hyacinthaceae), a New Species from the Tanqua Karoo (South Africa), With Notes on E. Haalenbergensis”. Anales del Jardín Botánico de Madrid 69, no. 2 (December 30, 2012): 201–208. Accessed October 5, 2022. https://rjb.revistas.csic.es/index.php/rjb/article/view/380.