Babita, et al. “A Comparative Study of Labetalol and Fentanyl on the Sympathomimetic Response to Laryngoscopy and Intubation in Vascular Surgeries”. Karnataka Anaesthesia Journal, vol. 1, no. 2, Apr. 2015, pp. 64-68, http://karnatakaanesthesiajournal.in/index.php/kaj/article/view/139367.