Arthur Twohig, Patrick, and Vaughn Huckfeldt. “Using Oral and Intranasal Dosage Forms of Ketamine for Managing Treatment-Resistant Depression: A Review of the Literature”. International Journal of Medical Students 4, no. 2 (July 27, 2016): 64-71. Accessed March 1, 2021. http://ijms.info/IJMS/article/view/153.