Panisales, A. M. C., Q. J. V. Catagayan, D. B. Geges, C. E. G. Jimena, E. S. Visco, and M. T. Malenab. “Business Sector”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 23, no. 2, July 2015, pp. 407-23, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4240.