A good first book would be “The Journey and the Dream” by Murray Bondo. Available for about $5.00 on Amazon.com. This book has been used in the Secular Franciscan Order to introduce folks to Francis and Franciscan spirituality.
Two I enjoyed are “Tales of Saint Francis” by Murray Bodo, and “Thomas of Celano’s First Life of Saint Francis of Assisi” Crazy Internet Junkie Society
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