Khan, Shahzad Maqsood, Nafisa Gull, Muhammad Yaseen Akram, Hakim Ali Haider, Muhammad Yasir Akram, Muhammad Imran, Muhammad Taqi Zahid Butt, and Tahir Jamil. 2013. “A Study on Synthesis and Testing of Polyols Using Soybean Oil and Castor Oil”. ASEAN Journal of Chemical Engineering 13 (2), 27-38. https://journal.ugm.ac.id/v3/AJChE/article/view/8154.