How Great Leaders Inspire Action Sources: Sinek, S. Start With Why: How Great Leaders Inspire Everyone to Take Action. Portfolio Hardcover: New York, 2009. Sinek, S. (2010, May 1). Simon Sinek: How great leaders inspire action | Video on TED.com. TED: Ideas worth spreading. Retrieved September 14, 2012, from http:// www.ted.com/talks/simon_sinek_how_great_leaders_inspire_action.html