Hummairoh, Siti, et al. “Penerapan Weighted Aggregated Sum Product Assesment (WASPAS) Dalam Pemilihan Duta Bahasa SUMUT”. Prosiding Seminar Nasional Ilmu Sosial Dan Teknologi, vol. 1, no. 1, Oct. 2021, pp. 154-61, https://prosiding.politeknikcendana.ac.id/index.php/sanistek/article/view/46.