Pradiskul, W., P. Maneerat, and N. Chirawichitchai. “Recommender System Using Collaborative Filtering A Case Study of Toyota Buzz Company Limited”. PKRU SciTech Journal, vol. 5, no. 1, June 2021, pp. 12-24, https://ph01.tci-thaijo.org/index.php/pkruscitech/article/view/241580.