ABDULZAHRA, ALI. “The Impact of Fun in the Workplace In Achieving Internal Marketing (Applied Research)”. Journal of Economics and Administrative Sciences 27, no. 126 (February 28, 2021): 410-431. Accessed May 15, 2021. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/2117.