Final answer:
Referent power is the ability to influence others based on personal qualities such as knowledge, attractiveness, or effort, leading to respect and admiration from others.
Step-by-step explanation:
Power that is obtained because of knowledge, personal attractiveness, or demonstration of effort is best defined as referent power. Referent power is a form of authority where the influence one has over others is based on the respect and admiration those others have for the person in power. This kind of power stems from the personal qualities of the individual, such as expertise, attractiveness, or effort, which makes others want to follow or be associated with them.