Bayazit, Zeynep, and Elif Guneren Genc. “An Analysis of Reciprocal Influence Between Advertising Expenditures and Gross Domestic Product”. International Journal of Economics and Financial Issues, vol. 9, no. 2, Mar. 2019, pp. 41-47, https://econjournals.com.tr/index.php/ijefi/article/view/7537.