Anything about St. Anselm of Canterbury or the ontological argument
In researching St. Anselm of Canterbury, Logos appears to have a massive gap in medieval theology and philosophy. Here are the major works in the order of importance and major secondary works from the 20th century, including some helpful anthologies.
Anselm of Canterbury, vols. 1-4
Edited and translated by Jaspter Hopkins and Herbert Richardson
The Edwin Mellen Press
1975
The Cambridge Companion to Anselm
Edited by Brian Davies and Brian Leftow
Cambridge University Press, 2004
ISBN 0-521-00205-2
The Letters of Saint Anselm of Canterbury, volume 1
Cistercian Studies Series no. 96
Translated and Annotated by Walter Frohlich
Cistercian Publications, Inc. 1993
The Letters of Saint Anselm of Canterbury, volume 2
Cistercian Studies Series no. 97
Translated and Annotated by Walter Frohlich
Cistercian Publications, Inc. 1993
Saint Anselm: A Portrait in a Landscape
Richard W. Southern
Cambridge University Press, 1990
ISBN 0-521-43818-7
Anselm's Pursuit of Joy: A Commentary on the Proslogion
Gavin R. Ortlund
The Catholic University of America Press, 2020
Ontological Arguments
Classic Philosophical Arguments series
Edited by Graham Oppy
Cambridge University Press, 2018
ISBN 978-1-107-55912-7
Anselm: Fides Quaerens Intellectum
Karl Barth
John Knox Press, 1960
Translated by Ian W. Robertson from Fides Quaerens Intellectum 2nd edition 1958, Evangelischer Verlag A. G. (Zurich, Switzerland)
The Ontological Argument from Saint Anselm to Contemporary Philosophers
Edited by Alvin Plantinga
Anchor Books (copyright Doubleday & Co., Inc., 1965)
Anselm's Discovery: A Re-examination of the Ontological Argument for God's Existence
Charles Hartshorne
Open Court Publishing, 1965