Ismail, A. G., and N. A. Sanusi. “An Empirical Analysis of Cash Flow and Investment Fluctuations Using Firm-Level Panel Data”. Gadjah Mada International Journal of Business, Vol. 7, no. 1, Jan. 2005, pp. 95-107, https://jurnal.ugm.ac.id/v3/gamaijb/article/view/14797.