A. RAMADHAN and R. Razali, “PENILAIAN KUALITAS JASA PELAYANAN LEMBAGA BIMBINGAN BELAJAR PRIMAGAMA BERDASARKAN PREFERENSI KONSUMEN (Studi kasus: Primagama cabang Medan)”, Noe, vol. 5, no. 2, pp. 66–71, Dec. 2022.