Khan, Yousaf Ali. “Investigating and Estimating the Size of Shadow Economy by Using Monetary Approach: Case Study of Malaysia”. Financial Metrics in Business 3, no. 2 (July 12, 2022): 219-226. Accessed April 30, 2025. https://www.syncsci.com/journal/FMB/article/view/FMB.2022.02.003.