Ali, Mazhar, Saif Ullah, and Mirza Jahanzaib. 1931. “A Novel Heuristic Approach for Multi-Mode Resource Constrained Project Scheduling Problems”. Quaid-E-Awam University Research Journal of Engineering, Science & Technology, Nawabshah. 17 (2), 13-20. http://publications.quest.edu.pk/ojs-3.1.1-4/index.php/qrj/article/view/102.