Rujukan Orbea (tumbuhan)

  1. 1 2 "Orbea Haw". Plants of the World Online. Taman Botani Diraja, Kew. 2023. Dicapai pada 10 Februari 2023.
  2. ↑ Haworth, Adrian Hardy. 1812. Synopsis plantarum succulentarum 37.
  3. ↑ Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Memoirs of the Botanical Survey of South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
  4. ↑ Leach, Leslie Charles. 1975. Kirkia 10(1): 289-291.

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