Which one of the following is not a source of managers power?

There are five sources of power people use over other people, including legitimate, reward, coercive, expe and referent. Legitimate power is also known as positional power. It&;s derived from the position a person holds in an organization's hierarchy.Reward power arises from the ability of a person to influence the allocation of incentives in an organization.Coercive power is derived from a person&;s ability to influence others threats, punishments or sanctions.Expe power is derived from possessing knowledge or expeise in a paicular area.Referent power is derived from the interpersonal relationships that a person cultivates with other people in the organization.