Ozcan, Cemile, et al. “Determination of Quercetin in Medicinal Plants Such As Rose Hip (Rosa canina), Bettle (Urtica dioica), Terebinth (Terebinthina Chica) and Purslane (Portulace Oleracea) Using HPLC-MS Method”. Asian Journal of Chemistry, vol. 24, no. 8, Apr. 2012, pp. 3396-00, https://asianpubs.org/index.php/ajchem/article/view/9380.