Ramu, B., S. Kumar, G. Srikanth, and Bigala Rajkamal. “Formulation and Evaluation of Sustained Release Verapamil Hydrochloride Using Natural Polymers”. INTERNATIONAL JOURNAL OF APPLIED PHARMACEUTICAL SCIENCES AND RESEARCH 1, no. 02 (June 13, 2016): 76-87. Accessed July 27, 2025. https://www.sierrajournals.com/index.php/IJAPSR/article/view/1019.