Salle, D. J. L., A. Beato, and G. Velkova. “Successful Strategies Leaders Use to Reduce Employee Turnover and Maintain Sustainability in For-Profit Colleges”. The International Journal of Business & Management, vol. 6, no. 4, Apr. 2018, https://internationaljournalcorner.com/index.php/theijbm/article/view/129661.