Sati, Z. S., and U. Susanto. “The Existence Of Loyalty In Indonesia Ministery Education Regulation On Electronic Text Book. (Study Of Vocational High School’s Electronic Text Book In Bandung)*)”. Journal of Theoretical and Applied Management (Jurnal Manajemen Teori Dan Terapan), vol. 6, no. 3, Sept. 2016, doi:10.20473/jmtt.v6i3.2676.