HILLIARD, O. M., and B. L. BURTT. 2005. “OLD WORLD GESNERIACEAE VII: CYRTANDRA SCHIZOSTYLA, C. VELUTINA AND THEIR RESPECTIVE ALLIES IN BORNEO”. Edinburgh Journal of Botany 61 (2-3): 131-45. https://doi.org/10.1017/S0960428605000235.