Hamdani, Muhammad. “The Effect Of Internal Communication On Work Productivity Of Employees Tata Graha In Star Hotel In Ajibata Sub-District, Toba Samosir District”. Jurnal Ilmiah Akomodasi Agung 6, no. 1 (April 30, 2019): 78-84. Accessed March 12, 2025. https://journal.akpardarmaagung.ac.id/index.php/JIAA/article/view/25.