Karchaliya, C., and P. Patel. “Development and Validation of Analytical Methods for Simultaneous Estimation of Amitriptyline Hydrochloride and Methylcobalamin in Their Tablet Dosage Form by UV Spectrophotometric Method”. PharmaTutor, Vol. 3, no. 7, July 2015, pp. 46-50, http://www.pharmatutorjournal.com/index.php/pt/article/view/294.