Template:Bolus, 1889
- Bolus, H. 1889. Contributions to South‐African Botany.– Part IV. (With a Revised List of published Species of Extra‐tropical South‐African Orchids). Journal of the Linnean Society, Botany 25(170): 156–210. DOI: 10.1111/j.1095-8339.1889.tb00795.x BHL