Herawan, T.A. et al. 2016. KLASIFIKASI HELPDESK UNIVERSITAS JENDERAL ACHMAD YANI MENGGUNAKAN CONCEPT FREQUENCY-INVERSE DOCUMENT FREQUENCY (CF-IDF) DAN K-NEAREST NEIGHBORS (K-NN). Prosiding Sains Nasional dan Teknologi. 1, 1 (Sep. 2016). DOI:https://doi.org/10.36499/psnst.v1i1.1518.