Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Keith I. Block and Mark N. Mead,"Immune System Effects of Echinacea, Ginseng, and Astragalus: A Review",Integrative Cancer Therapies,1534-7354,SAGE Publications,2003-09,2,3,247-267,https://cir.nii.ac.jp/crid/1363388843387624320,https://doi.org/10.1177/1534735403256419