F. Mansor, N., Z. Abal Abas, A. S. Shibghatullah, and A. F.N. Abdul Rahman. 2018. “Bus Driver Scheduling and Rostering: Maximise Fairness Using Enhanced Harmony Search Algorithm With Varieties of Step Functions and Fret Spacing Formula”. International Journal of Engineering & Technology 7 (3.28): 136-43. https://doi.org/10.14419/ijet.v7i3.28.24682.