Rosyad, Ilyas, Sari Narulita, and Andy Hadiyanto. “Upaya Optimalisasi Kinerja Pegawai Melalui Penerapan Nilai-Nilai Spiritualitas Islam”. Jurnal Studi Al-Qur’an 11, no. 2 (July 1, 2015): 145 - 156. Accessed October 14, 2019. http://journal.unj.ac.id/unj/index.php/jsq/article/view/4387.