Among the three primary sources of leadership, which is NOT mentioned in the material?

The concept that is identified as not being mentioned among the primary sources of leadership is internal leadership. While the other concepts like self-leadership, participative leadership, and external leadership are commonly discussed in the context of leadership studies, internal leadership focuses specifically on the intrinsic qualities and motivations that are typically part of self-leadership.

Self-leadership emphasizes personal accountability and the ability to influence oneself to achieve goals and navigate challenges. Participative leadership refers to involving team members in decision-making processes, which fosters collaboration and inclusion. External leadership, on the other hand, is concerned with the influence and guidance that can come from outside the organization or team structure.

In contrast, "internal leadership" does not have the same established recognition among the other three concepts, which have more clear definitions and frameworks within the realm of management and leadership literature. This distinction clarifies why internal leadership is not considered a primary source of leadership in the content you are studying.