1. Trade, environment & sustainable development;Arendse,2001
2. Genealogical perspectives on the species problem;Baum,1995
3. CAPE, 2008. http://www.capeaction.org.za. Accessed 22 January 2008.
4. TCS: a computer program to estimate gene genealogies;Clement;Molecular Ecology,2000
5. Fire and its role in coexistence and speciation in Gondwanan shrublands;Cowling;South African Journal of Science,1987