Yücesan, M. “Green Supplier Selection for Plastic Industry Using Integrated Model Based on Pythagorean Fuzzy AHP and Fuzzy TOPSIS”. İşletme Araştırmaları Dergisi, c. 11, sy 1, Haziran 2021, ss. 26-41, https://isarder.org/index.php/isarder/article/view/738.