^Roberts, Margaret F.; Timmermann, Barbara N.; Mabry, Tom J. (1980). "6-Methoxyflavonols from Brickellia veronicaefolia (compositae)". Phytochemistry. 19: 127–129. doi:10.1016/0031-9422(80)85028-X.
^Smith, D.M.; Glennie, C.W.; Harborne, J.B. (1971). "Identification of eupalitin, eupatolitin and patuletin glycosides in Ipomopsis aggregata". Phytochemistry. 10 (12): 3115–3120. doi:10.1016/S0031-9422(00)97361-8.