The Leadership Challenge
by James M. Kouzes, Barry Z. Posner · James M. Kouzes & Barry Z. Posner
Kouzes and Posner's research-based leadership model, built from thousands of case studies and surveys of leaders, organized around five practices: model the way, inspire a shared vision, challenge the process, enable others to act, and encourage the heart. Readers learn concrete behaviors for each practice.
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More resources on Leadership Styles
hbr.org
Harvard Business Review (hbr.org) offers research-based articles, case studies, and practical guidance on leadership, strategy, and organizational performance for managers and executives.
Why good leaders make you feel safe | Simon Sinek
Simon Sinek's 2014 TED talk arguing that effective leaders build a circle of safety, sacrificing for their teams so people trust one another and cooperate. Explains how that sense of security drives loyalty and discretionary effort inside organizations.
Verywell Mind: Leadership Styles
Overview of styles with pros/cons
Harvard Business Review: The Six Leadership Styles
Daniel Goleman's 2000 Harvard Business Review article presenting six leadership styles: coercive, authoritative, affiliative, democratic, pacesetting, and coaching. Drawing on Hay/McBer research with 3,871 executives, it explains how each style affects organizational climate and results, and when to switch styles.
How great leaders inspire action
Simon Sinek's 2009 TEDx talk introducing the golden circle: why purpose precedes method and product in persuasion. As a model of presentation craft, it shows a single idea carried by repetition, drawing, and restraint.
mindtools.com
Mind Tools offers practical business and management resources—articles, templates, checklists, and self-assessments—covering business communication, leadership, teamwork, meetings, and professional writing.