Sani, T., and R. Rochmoeljati. “Analysis of Waste in Traffic Services on The Surabaya-Gesik Toll Road for Optimization With Lean Service Method at PT Margabumi Matraraya”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE), Vol. 8, no. 2, May 2025, pp. 5571-86, doi:10.31538/iijse.v8i2.6332.