1. 8x8, Inc. (2012). The cost advantages of using a hosted unified communications service: A total-cost-of-ownership guide for small and med-sized businesses. Retrieved May 2016, from http://webtorials.com/main/resource/papers/8x8/paper1/hosted-uc-roi.pdf
2. Leader distance: A review and a proposed theory;Antonakis;The Leadership Quarterly,2002
3. Authentic leadership development: Getting to the root of positive forms of leadership;Avolio;Leadership Quarterly,2005
4. Balthazard, P. A., Waldman, D. A., & Atwater, L. E. (2007). The mediating effects of leadership and interaction style in face-to-face and virtual teams. In S. P. Weisband (Ed.), Leadership at a distance: Research in technologically-supported work (pp. 127-150). New York: Psychology Press.
5. Scale development and construct clarification of servant leadership;Barbuto;Group & Organization Management,2006