N. Hidayah and R. Hastasari, “Analisis Tingkat Kepuasan Karyawan Terhadap Lingkungan Kerja Di PT Qualis Indonesia Dengan Metode Customer Satisfaction Index : Analysis of Employee Satisfaction Levels with the Work Environment at PT Qualis Indonesia Using the Customer Satisfaction Index Method ”, JMAEKA, vol. 2, no. 4, pp. 703–710, Feb. 2026.