↑Andrew Millington; Mark Blumler; Udo Schickhoff (2011년 9월 22일). 《The SAGE Handbook of Biogeography》. SAGE Publications. 143–쪽. ISBN978-1-4462-5445-5. 2019년 4월 26일에 확인함. The Cape Floristic Region in South Africa is comparatively rich in endemic flowering-plant families. Five families of angiosperms (Penaeaceae, Roridulaceae, Geissolomataceae, Grubbiaceae, and Lanariaceae) are endemic to that region ...
↑Stevens, P. F. (2001 onwards). Penaeaceae.. Angiosperm Phylogeny Website. Version 12, July 2012 [and more or less continuously updated since]. Accessed online: 5 June 2013.