Kamal, A., F.J. Ahmad, S. Ahmad, and K. Saleem. “A Validated HPLC Method for the Quantification of Hypericin in Hypericum Perforatum”. Asian Journal of Chemistry 24, no. 10 (May 14, 2012): 4689–4692. Accessed July 22, 2024. https://asianpubs.org/index.php/ajchem/article/view/9601.