Coercive Power
Coercive power is the threat and application of sanctions and other negative consequences. These can include direct punishment or the withholding of desired resources or rewards. Coercive power relies on fear to induce compliance.
Expert Power
Expert power draws from a person's skills and knowledge and is especially potent when an organization has a high need for them. Narrower than most sources of power, the power of an expert typically applies only in the specific area of the person's expertise and credibility.
Source: Boundless. “Sources and Uses of Power.” Boundless Management. Boundless, 14 Nov. 2014. Retrieved 19 Nov. 2014 from https://www.boundless.com/management/textbooks/boundless-management-textbook/leadership-9/defining-leadership-68/sources-and-uses-of-power-339-7332/
Source: Boundless. “Sources and Uses of Power.” Boundless Management. Boundless, 14 Nov. 2014. Retrieved 19 Nov. 2014 from https://www.boundless.com/management/textbooks/boundless-management-textbook/leadership-9/defining-leadership-68/sources-and-uses-of-power-339-7332/