Gilbert, Ocen, Semwogerere Twaibu, Sekamwa Umar, and Matovu Davis. “An Analytical Review of Existing Supermarket Billing Systems”. East African Journal of Information Technology 4, no. 1 (November 26, 2021): 1-6. Accessed March 28, 2024. https://journals.eanso.org/index.php/eajit/article/view/440.