Botha, J.; Witkowski, E.T.F.; Shackleton, C.M. (2004). "The impact of commercial harvesting on Warburgia salutaris ('pepper-bark tree') in Mpumalanga, South Africa". Biodiversity and Conservation. 13 (9): 1675. doi:10.1023/B:BIOC.0000029333.72945.b0. S2CID33016408..
dwaf.gov.za
www2.dwaf.gov.za
"Protected Trees"(PDF). Department of Water Affairs and Forestry, Republic of South Africa. 3 May 2013.
Botha, J.; Witkowski, E.T.F.; Shackleton, C.M. (2004). "The impact of commercial harvesting on Warburgia salutaris ('pepper-bark tree') in Mpumalanga, South Africa". Biodiversity and Conservation. 13 (9): 1675. doi:10.1023/B:BIOC.0000029333.72945.b0. S2CID33016408..