If it's true that all people are grieving about something, then it's important for leaders to know how to work with grief and healing. These books offer a great way to get started.
Managing Transitions
by William Bridges
Working It Through: An Elisabeth Kubler-Ross Workshop on Life, Death and Transition
by Elisabeth Kubler-Ross
Coming Back to Life: Practices to Reconnect Our Lives, Our World
by Joanna Macy and Molly Young Brown, Foreword by Matthew Fox
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Consolations: The Solace, Nourishment and Underlying Meaning of Everyday Words
by David Whyte