There is an immense literature on this, but you might find as a starting point David N. Bell, _Image and Likeness: The Augustinian Spirituality of William of St. Thierry_, Cistercian Studies series, ca. 1978. This was Bell's dissertation and he showed that much of what had been attributed to Greek sources in William of St. Thierry could readily have come from Augustine.
It is often claimed that Augustine employed a purely psychological understanding of the Trinity. This is not correct. He employs the triad of lover, loved and love that is employed by Richard of St. Victor in _De Trinitate_ at various places, including in the Tractates on First John. Richard of St. Victor's _De trinitate is sometimes portrayed as lest Augustinian and more like Eastern/Greek theology, but I think such views sell Augustine short. You might also consult John Edward Sullivan, _The Image of God: The Doctrine of St. Augustine and Its Influence_ (Dubuque: Priory Press, 1963). Sullivan has a section on Thomas Aquinas in comparison with Augustine. Anna S. Williams' recent dissertation at Yale (Lindbeck), published a year or two ago, probaby by Oxford, compares Gregory Palamas and Aquinas on some of these issues and might have more recent literature, though sometimes she is less thorough on the previous scholarship on the Western image of God/deification/theosis tradition than she is on the Eastern tradition--e.g., I don't think she takes account of Sullivan, though my comments here are based on the dissertation and I am ready to be corrected.
See also, Gerald Bonner, "Augustine's Doctrine of Man: Image of God and Sinner," _Augustinianum_, 24 (1984), 495-514
This only scratches the surface, but is what I have immediately at hand.
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I'd like to ask the list members for any medieval sources (particularly up
through the twelfth century) that develop or make reference to Augustine's
model of the soul as being a unity of memory, understanding and will. I
would be especially interested in anything that applies this model in a
practical way to spiritual development. And I would be very glad indeed if
you could also indicate whether (and where) these works are easily accessible.
Thanks very much, in advance.
Lisa Nicholas, Ph.D. candidate
Institute of Philosophic Studies
University of Dallas