Dr. Roktim Saemah, Sanjeev Kumar KM,. “Analysis of Digital and Conventional Marketing through Return on Asset With Implications of SE-SM Optimizations and SE Marketing”. International Journal of Advanced Science and Technology 28, no. 18 (December 26, 2019): 360 -. Accessed December 5, 2020. http://sersc.org/journals/index.php/IJAST/article/view/2377.