Bekhet, Hussain Ali, and Nor Hamisham Harun. “Elasticity and Causality Among Electricity Generation from Renewable Energy and Its Determinants in Malaysia”. International Journal of Energy Economics and Policy, vol. 7, no. 2, Apr. 2017, pp. 202-16, https://mail.econjournals.com/index.php/ijeep/article/view/4223.