AT Borchers, CL Keen, JS Stern, ME Gershwin «Inflammation and Native American medicine: the role of botanicals». Am J Clin Nutr, 72, 2, 2000, pàg. 339-47. DOI: 10.1093/ajcn/72.2.339. PMID: 10919925.
Tierra, Michael «Echinacea: an effective alternative to antibiotics». J Herb Pharmacother, 7, 2, 2007, pàg. 79-89. DOI: 10.1300/j157v07n02_06. PMID: 18285309.
AT Borchers, CL Keen, JS Stern, ME Gershwin «Inflammation and Native American medicine: the role of botanicals». Am J Clin Nutr, 72, 2, 2000, pàg. 339-47. DOI: 10.1093/ajcn/72.2.339. PMID: 10919925.
Tierra, Michael «Echinacea: an effective alternative to antibiotics». J Herb Pharmacother, 7, 2, 2007, pàg. 79-89. DOI: 10.1300/j157v07n02_06. PMID: 18285309.