Shang, A.; Huwiler, K.; Nartey, L.; Jüni, P.; Egger, M. (2007). "Placebo-controlled trials of Chinese herbal medicine and conventional medicine comparative study". International Journal of Epidemiology cilt=36, 5. ss. 1086-92. doi:10.1093/ije/dym119. PMID17602184.KB1 bakım: Dikey çizgi eksik (link)
Siegfried, N. L; Hughes, G (2012). "Herbal medicine, randomised controlled trials and global core competencies". South African Medical Journal. 102 (12). ss. 912-3. doi:10.7196/samj.6392. PMID23498035.
Shang, A.; Huwiler, K.; Nartey, L.; Jüni, P.; Egger, M. (2007). "Placebo-controlled trials of Chinese herbal medicine and conventional medicine comparative study". International Journal of Epidemiology cilt=36, 5. ss. 1086-92. doi:10.1093/ije/dym119. PMID17602184.KB1 bakım: Dikey çizgi eksik (link)
Siegfried, N. L; Hughes, G (2012). "Herbal medicine, randomised controlled trials and global core competencies". South African Medical Journal. 102 (12). ss. 912-3. doi:10.7196/samj.6392. PMID23498035.