1. Identification of Essential Oil Components by Gas Chromatography/Mass Spectrometry;Adams,2007
2. The genus Pegolettia (Compositae, Inuleae);Anderberg;Cladistics,1986
3. Kruierate van die Montagu Museum;Anonymous,2001
4. Veld Medicine from the Klein Karoo;De Jager,2010
5. European Directorate for the Quality of Medicines, Determination of Essential Oils in Vegetable Drugs;European Pharmacopoeia,2005