Upadhyay, Hari Prasad, and Bijay Lal Pradhan. “Sample Size Estimation in Medical Research Based Upon Study Design”. Journal of College of Medical Sciences-Nepal 19, no. 2 (June 30, 2023): 237–45. Accessed December 4, 2024. https://nepjol.info/index.php/JCMSN/article/view/23978.