Weber, A., Wei, Y.G., Puglisi, C., Wen, F., Mayer, V. and Moller, M. 2011. A new definition of the genus Petrocodon (Gesneriaceae). Phytotaxa. 23, 1 (May 2011), 49–67. DOI:https://doi.org/10.11646/phytotaxa.23.1.3.