M. A. A. Rashid, M. N. A. Othman, S. S. Rashid, and M. B. Ali, “Exploring Reduce, Recycle and Reuse (3Rs) Awareness, Practice among Oil and Gas Workers and its Influence on Their Productivity”, IJEFI, vol. 5, no. 1S, pp. 281–285, Jul. 2015.