Tuman P. Rai, Anup Pramanik, Dipayan Purakayastha, Madhvi Ghadge, and Shiv Garg. “Sublingual Route for the Systemic Delivery of Drugs”. World Journal of Pharmaceutical Sciences, vol. 7, no. 1, Jan. 2019, pp. 38-45, https://wjpsonline.com/index.php/wjps/article/view/sublingual-route-systemic-delivery-drugs.