Manasseh, Charles O., et al. “Did Global Financial Crisis Worsen Oil Price Volatility and Banking Sector Nexus in Selected ECOWAS and G-7 Member Countries?”. International Journal of Energy Economics and Policy, vol. 10, no. 6, Oct. 2020, pp. 390-5, https://econjournals.org.tr/index.php/ijeep/article/view/9961.