Jessica, Jessica, and Seng Hansun. “Forecasting Motorcycle Sales Using Nearest Symmetric Trapezoidal Fuzzy Number”. Ultimatics : Jurnal Teknik Informatika 8, no. 2 (October 3, 2016): 75-82. Accessed November 21, 2024. https://ejournals.umn.ac.id/index.php/TI/article/view/515.