Harvard Business Review
One of the best sources of information for theories, practical insights and articles is Harvard Business Review (HBR). It is regularly updated and features a wide range of contributors and view points.
HBR also does a good job of bringing together both leadership theory as well a information or studies from real life organisations.
For more information see: http://www.hbr.org/
Key articles I think can be of use to you as the future leaders of organisations:
What makes a good leader? by Daniel Goleman. Goleman is a respected author in this area. This piece uses his work on Emotional intelligence and shows in what ways the most effective leaders are alike. See: https://hbr.org/2004/01/what-makes-a-leader/ar/1
Leading People When They Know More than You Do by Wanda T. Wallace and David Creelman. It can be a tricky skill to master but often when you are first put in charge of a team you can end up managing or leading people with more skills and experience than yourself. Four areas for you to consider and reflect on. See: https://hbr.org/2015/06/leading-people-when-they-know-more-than-you-do
What Great Managers Do by Marcus Buckingham. This work includes a survey of 80,000 managers over two years. They found there are many styles of management but there is one quality that sets great managers apart. They discover what is unique about each person and then capitalise on it. Look at some real life examples from this survey and see what you can personally learn from it. See: https://hbr.org/2005/03/what-great-managers-do
Be a Leader Who Can Admit Mistakes by Jim Whitehurst. Jim is the CEO of Red Hat. Hear from him about his personal reflections on his leadership journey including to make the time to explain why you made your decisions to avoid people assuming the worst. What could we all learn from this? See: https://hbr.org/2015/06/be-a-leader-who-can-admit-mistakes
What Everyone Should Know About Office Politics by Dana Rousmaniere. Why playing politics is so unavoidable. Work involves people, and people are emotional beings with conflicting wants, needs, and underlying (often unconscious) biases and insecurities. Learn more about this to help you deal with the politics in your own office. See: https://hbr.org/2015/02/what-everyone-should-know-about-office-politics
Although CIPD is often thought of as a resource for HR Professionals it can also be a good source of research, surveys/data, and articles on the topic of leadership. They have done much work on what staff think makes a good leader.
For the 'homepage' on leadership see: http://www.cipd.co.uk/hr-topics/leadership.aspx
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