ANURADHA.S.N., and ARUNKUMAR.S. “A Validated Rp – Hplc Method For Simultaneous Estimation Of Vitamin A And Vitamin E In Multivitamin Tablet Dosage Form”. International Journal of Pharma and Bio Sciences, vol. 3, no. 3, Sept. 2012, pp. 322-7, https://ijpbs.net/index.php/journal/article/view/1488.