D. Abdullah, T. ., S. Suwilo, S. Efendi, H. ., and C. Ita Erliana, “A Slack-Based Measures for Improving the Efficiency Performance of Departments in Universitas Malikussaleh”, IJET, vol. 7, no. 2, pp. 491–494, Apr. 2018, doi: 10.14419/ijet.v7i2.11253.