Sultana, Saki, and Kamrul Khosru. “Practice of Using Gifts As Promotional Materials for Marketing of Pharmaceutical Products in Bangladesh: A Survey Conducted on General Physicians and Representatives from Pharmaceutical Companies”. Stamford Journal of Pharmaceutical Sciences 4, no. 2 (April 21, 2012): 13-18. Accessed January 24, 2021. https://www.banglajol.info/index.php/SJPS/article/view/10434.