Hafeez, Shakir, Aman Ullah Khan, Bilal Bin Saeed, and Yasir Javed. 2016. “Relationship Among Perceived Stress, Academic Performance and Use of Energy Drinks: A Study on Universities’ and Medical Students of Khyber Pakhtunkhwa Province of Pakistan”. International Review of Management and Marketing 6 (3):494-99. https://www.econjournals.com/index.php/irmm/article/view/2421.