Soputan, Grace Jenny, and Tini Mogea. “Leadership Effectiveness Toward Service Productivity”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 13, no. 1 (January 18, 2014): 103–110. Accessed July 3, 2024. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/1356.