Mustamin, M., A. . Ahmad, J. Jasruddin, A. . Syam, and F. Fitriani. “The Effect of Academic Services Quality Toward the Cadets Learning Motivation at Politeknik Ilmu Pelayaran Makassar”. International Journal of Learning, Teaching and Educational Research, vol. 18, no. 10, Oct. 2019, pp. 128-41, http://ijlter.net/index.php/ijlter/article/view/481.