Alrafadi, K. M. S., M. M. . Yusuf, and B. H. . Kamaruddin. “Measuring Efficiency in Banks: A Brief Survey on Non – Parametric Technique (Data Envelopment Analysis)”. International Journal of Business, Economics and Management, vol. 3, no. 5, May 2016, pp. 52-68, doi:10.18488/journal.62/2016.3.5/62.5.52.68.