Tai, Joseph; Cheung, Susan; Chan, Edwin (8 June 2004). "In vitro culture studies of Sutherlandia frutescens on human tumor cell lines". Journal of Ethnopharmacology. 93 (1): 9–19. doi:10.1016/j.jep.2004.02.028. ISSN0378-8741. PMID15182898.
Tai, Joseph; Cheung, Susan; Chan, Edwin (8 June 2004). "In vitro culture studies of Sutherlandia frutescens on human tumor cell lines". Journal of Ethnopharmacology. 93 (1): 9–19. doi:10.1016/j.jep.2004.02.028. ISSN0378-8741. PMID15182898.
Tai, Joseph; Cheung, Susan; Chan, Edwin (8 June 2004). "In vitro culture studies of Sutherlandia frutescens on human tumor cell lines". Journal of Ethnopharmacology. 93 (1): 9–19. doi:10.1016/j.jep.2004.02.028. ISSN0378-8741. PMID15182898.