Maithani, Alok, et al. “QUANTITATIVE ESTIMATION OF BERBERINE CONTENT OF BERBERIS ASIATICA FROM DIFFERENT ALTITUDE OF GARHWAL HIMALAYA”. Asian Journal of Pharmaceutical and Clinical Research, vol. 7, no. 6, Feb. 2014, pp. 165-7, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/872.