H.L. Blomquist (1957). «A revision of Hexastylis of North America». Brittonia. 8 (4): 255–281. JSTOR2804978. doi:10.2307/2804978
nih.gov
ncbi.nlm.nih.gov
Schaneberg BT, Applequist WL, Khan IA (outubro 2002). «Determination of aristolochic acid I and II in North American species of Asarum and Aristolochia». Pharmazie. 57 (10): 686–9. PMID12426949