Ohazulike , Leo Atuchukwu, and Chendo Nkoli. “ The Essence of Business Management and Entrepreneurship in the Nigerian Marketing System ”. African Journal of Education,Science and Technology (AJEST), vol. 1, no. 1, Jan. 2013, pp. Pg 259-268, https://ajest.org/index.php/ajest/article/view/314.