This book is part of a trilogy of studies by Douglas Dales intended for general Christian readership while being academically based.
Divine Remaking - St Bonaventure & the Gospel of Luke [ISBN 9780227176535: 2017] - this examines his distinctive presentation of the Gospel of St Luke
Way back to God - the Spiritual Theology of St Bonaventure [ISBN 9780227176931: 2019] - this tracks his spiritual theology through most of his writings.
Truth & Reality - the Wisdom of St Bonaventure [forthcoming early 2021] - this is a study of his Collations on the Hexaemeron.
They may be obtained from James Clarke & Co, Cambridge, UK, in various formats.