Mukherjee, A., B. Wilske, R.A. Navarro, A. Dippenaar-Schoeman, and L.G. Underhill. 2010. “Association of Spiders and Lichen on Robben Island, South Africa: A Case Report”. Journal of Threatened Taxa 2 (4):815-19. https://doi.org/10.11609/JoTT.o2295.815-9.