“PENILAIAN KUALITAS JASA PELAYANAN LEMBAGA BIMBINGAN BELAJAR PRIMAGAMA BERDASARKAN PREFERENSI KONSUMEN (Studi Kasus: Primagama Cabang Medan)”. 2022. Nusantara of Engineering (NOE) 5 (2): 66-71. https://doi.org/10.29407/noe.v5i2.19021.