Rehman, Fazal ur, Tariq Nawaz ., Ishfaq Ahmed ., and Shabir Hyder . “Some Insights in the Historical Prospective of Hierarchy of Effects Model: A Short Review”. Information Management and Business Review 6, no. 6 (December 30, 2014): pp. 301-308. Accessed May 18, 2024. https://ojs.amhinternational.com/index.php/imbr/article/view/1128.