Below are a few texts that (in varying degrees) touch upon the issue of the filioque
A. Edward Siecienski. The Use of Maximus the Confessor's Writing on the Filioque at the Council of Ferrara-Florence (1438–1439)
. Ann Arbor, Michigan: UMI Dissertation Services, 2005.
Aristeides Papadakis. Crisis in Byzantium: The Filioque Controversy in the Patriarchate of Gregory II of Cyprus (1283–1289)
. New York: Fordham University Press, 1983.
Aristeides Papadakis. The Christian East and the Rise of the Papacy
. Crestwood, NY: St. Vladimir's Seminary Press, 1994, pp. 232-238 and 379-408.
Richard Haugh. Photius and the Carolingians: The Trinitarian Controversy
. Belmont, MA: Nordland Publishing Company, 1975.
David Bradshaw. Aristotle East and West: Metaphysics and the Division of Christendom
. Cambridge: Cambridge University Press, 2004, pp. 214–220.
I have also posted a brief essay that I wrote on the filioque at my own website, click the link below if you wish to peruse it:The Filioque Controversy