Fahrani, D., Wessiani, N. A., & Santosa, B. (2011) Analisis komitmen organisasi dan employee engagement pada PT Semen Gresik (Persero) Tbk [Analysis of organizational commitment and employee engagement at PT Semen Gresik (Persero) Tbk] (Undergraduate’s Thesis), Institut Teknologi Sepuluh November, Surabaya, Indonesia.