WAGNER, RUSSELL (2007-11). [281:byotbc2.0.co;2 «Bradleya 25/2007, Yearbook of the British Cactus and Succulent SocietyBradleya 25/2007, Yearbook of the British Cactus and Succulent Society. ISBN: 0 902099 79 5. SB. 196 SB. £24 foreign.»]. Cactus and Succulent Journal79 (6): 281-282. ISSN0007-9367. doi:10.2985/0007-9367(2007)79[281:byotbc]2.0.co;2. Consultado el 4 de enero de 2025.
doi.org
WAGNER, RUSSELL (2007-11). [281:byotbc2.0.co;2 «Bradleya 25/2007, Yearbook of the British Cactus and Succulent SocietyBradleya 25/2007, Yearbook of the British Cactus and Succulent Society. ISBN: 0 902099 79 5. SB. 196 SB. £24 foreign.»]. Cactus and Succulent Journal79 (6): 281-282. ISSN0007-9367. doi:10.2985/0007-9367(2007)79[281:byotbc]2.0.co;2. Consultado el 4 de enero de 2025.
WAGNER, RUSSELL (2007-11). [281:byotbc2.0.co;2 «Bradleya 25/2007, Yearbook of the British Cactus and Succulent SocietyBradleya 25/2007, Yearbook of the British Cactus and Succulent Society. ISBN: 0 902099 79 5. SB. 196 SB. £24 foreign.»]. Cactus and Succulent Journal79 (6): 281-282. ISSN0007-9367. doi:10.2985/0007-9367(2007)79[281:byotbc]2.0.co;2. Consultado el 4 de enero de 2025.