Abdullah MM. The Role of Content Marketing in Achieving Customer Happiness An Analytical Study of the Opinions of a Sample of (Apple - Iphone) Users in Three Faculties of Tikrit University. Tikrit J. Admin. Econ. Sci. [Internet]. 2022 Sep. 30 [cited 2026 Mar. 7];18(59, 2):157-75. Available from: https://www.tjaes.org/ojs/index.php/tjaes/article/view/472