Books:
Cassiodorus, St. Gregory the Great, and Anonymous Greek Scholia. Writings on the Apocalypse.
Pseudo-Cyril of Alexandria. Commentary on the Apocalypse
Tyconius: Exposition of the Apocalypse
Early Latin Commentaries on the Apocalypse
Carolingian Commentaries on the Apocalypse by Theodulf and Smaragdus
The Seven Seals of the Apocalypse
Revelation and the First Century
Articles:
“The Date of Revelation in the Early Church” in the book New Testament Eschatology available from American Vision books
“More External Evidence for an Early Date of Revelation” in the book New Testament Eschatology available from American Vision books
Two Early Medieval Hiberno-Latin Texts on the New Jerusalem
Patristic Commentaries on Revelation, update
Millennialism and the Early Church Councils
Chromatius of Aquileia on John and Rev
“Exegesis of the Apocalypse in the Tenth Century” was recently published as Chapter 8 in the Cambridge Companion to Apocalyptic Literature edited by Colin McAllister.
“Antipas in Early Commentaries” is available in the book The Rapture and the Fig Tree Generation by Gary DeMar at American Vision books.