K. P. Ningsih, Z. K. Purbobinuko, D. A. Pradipta, I. M. Farhan, and K. L. Rohmah, “Klakson: Innovation in the Development of a Barber Johnson Charting Calculator Based on an Early Warning System (EWS)”, PELS, vol. 6, pp. 268-273, Nov. 2024.