M. Hasyim Tuankotta, W. Ismail Kurnia, S. Yana Purwaningsih, M. Maslina, and P. Budi, “Analysis of the Effect of Work Shifts on the Fatigue Level of Operators of Balikpapan City Drinking Water Area Companies”, JISEM, vol. 1, no. 2, pp. 48–54, Oct. 2022.