Rasiah, R., S. Somasundram, and G. Subramaniam. “A Multivariate Cointegration Analysis of the Macroeconomic Determinants of Carbon Emissions in Malaysia”. International Journal of Energy Economics and Policy, vol. 8, no. 6, Oct. 2018, pp. 202-8, https://www.econjournals.com/index.php/ijeep/article/view/7110.