Rakotonandrasana, S.R., Oskolski, A.A., Tilney, P.M., Kotina, E.L. & van Wyk, B.-E. (2017)

The rediscovery of Billburttia vaginoides, with notes on the morphology, anatomy, traditional uses and conservation status of the genus Billburttia (Apieae, Apiaceae)

. Phytotaxa 321 (3): 265–276. https://doi.org/10.11646/phytotaxa.321.3.4