Jeperson Hutahaean, Rahul B. Chauhan, Sameer Ahmed S. Shah, Andino Maseleno, Apri Wahyudi. “A Research Study on Logistic and E-Commerce of Amazon and Flip-Kart”. International Journal of Advanced Science and Technology, Vol. 29, no. 06, Apr. 2020, pp. 1917 -31, http://sersc.org/journals/index.php/IJAST/article/view/12897.