Boele, K., Kroesen, A. C., & Noltee, F. K. (1987). Checklist of Brachystelma R. Br., Ceropegia L., Riocreuxia Decne., and the genera of the Stapelieae s. s. (Asclepiadaceae): With literature references to all species (1. publ.). Southern Reprographics.
Chicago-Zitierstil (17. Ausg.)Boele, Kees, Albert C. Kroesen, und Frans K. Noltee. Checklist of Brachystelma R. Br., Ceropegia L., Riocreuxia Decne., and the Genera of the Stapelieae S. S. (Asclepiadaceae): With Literature References to All Species. 1. publ. Burgess Hill: Southern Reprographics, 1987.
MLA-Zitierstil (9. Ausg.)Boele, Kees, et al. Checklist of Brachystelma R. Br., Ceropegia L., Riocreuxia Decne., and the Genera of the Stapelieae S. S. (Asclepiadaceae): With Literature References to All Species. 1. publ. Southern Reprographics, 1987.