Tang, Chor Foon. “The Health-Income Nexus for Malaysia: ARDL Cointegration and Rao’s F-Test for Causality”. Asian Journal of Empirical Research 2, no. 1 (March 14, 2012): 1–8. Accessed July 3, 2024. https://archive.aessweb.com/index.php/5004/article/view/2789.