Ara, E., A. Akhter, and M. A. Hoque. “Analyzing the Changes of Preference Factors of Billboard by the Gender, Age & Occupation of Customer: A Study on Dhaka City”. AIUB Journal of Business and Economics, vol. 12, no. 1, Nov. 2015, pp. 81-100, https://ajbe.aiub.edu/index.php/ajbe/article/view/75.