Pulla Reddy, M., A.K.S. Bhujanga Rao, V. Usharani, and P.K. Dubey. 2010. “Novel and Improved Process for the Preparation of Citalopram”. Asian Journal of Chemistry 23 (4):1829-32. https://asianpubs.org/index.php/ajchem/article/view/10228.