Talari Muralikrishna, P. R. Sivasankar, Ragala Narayana, and Lanka Vimala Rachel. “Assessment of Pre-Surgical Depression, Anxiety, and Stress Levels in Patients Undergoing Surgical Procedures in the General Surgery Department”. Asian Pacific Journal of Health Sciences, vol. 8, no. 1, Jan. 2021, pp. 101-3, doi:10.21276/apjhs.2021.8.1.22.