Sattar, Irfan, and Azra Maqsood. “A Marketing Mix Model for Pharmaceutical Industry — A Pakistani Perspective”. JISR management and social sciences & economics 1, no. 2 (December 31, 2003): 18–22. Accessed May 10, 2024. https://jisrmsse.szabist.edu.pk/index.php/szabist/article/view/415.