Smith, Gideon F. 2023. “A Review of the Infrageneric Classifications Proposed for Kalanchoe (Crassulaceae Subfam. Kalanchooideae) from the Earliest Times up to 2000”. Phytotaxa 619 (1). Auckland, New Zealand:1-38. https://doi.org/10.11646/phytotaxa.619.1.1.