The document discusses several theories of leadership, including: 1) Path-goal leadership theory which includes directive, supportive, achievement-oriented, and participative styles. 2) Situational leadership theory which includes telling, selling, participating, and delegating styles. 3) Rensis Likert's management systems which range from exploitive/authoritative to participative/group systems based on levels of trust and interaction. 4) Emerging approaches like charismatic, transactional vs transformational, and social learning theories as well as substitutes for leadership.