^Zhao, J; Dasmahapatra, AK; Khan, SI; Khan, IA (December 2008). “Anti-aromatase activity of the constituents from damiana (Turnera diffusa)”. Journal of Ethnopharmacology120 (3): 387–393. doi:10.1016/j.jep.2008.09.016. PMID18948180.
^Valkama, E; Salminen, J-P; Koricheva, J; Pihlaja, K. “Changes in Leaf Trichomes and Epicuticular Flavonoids during Leaf Development in Three Birch Taxa”. Annals of Botany94: 233–242. doi:10.1093/aob/mch131.