Ahmad, Mushtaq, Mir Ajab Khan, Aurangzeb Hasan, Muhammad Zafar, and Shazia Sultana. 2010. “Chemotaxonomic Standardization of Herbal Drugs Milk Thistle and Globe Thistle”. Asian Journal of Chemistry 20 (6):4443-59. https://asianpubs.org/index.php/ajchem/article/view/19043.