et.al, R. R. “The Similarity of Essay Examination Results Using Preprocessing Text Mining With Cosine Similarity and Nazief-Adriani Algorithms”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 3, Apr. 2021, pp. 1415-22, https://turcomat.org/index.php/turkbilmat/article/view/938.