I have used the following books extensively in my research. There are many other fine books not listed, including newer translations of standard works. Unfortunately, I do not own these other books and my access to them was limited. Some of this material is available online and at no cost.
The definitive online bibliography of Evagrian studies is maintained by Joel Kalvasmaki at http://evagriusponticus.net/.
Bamberger, John Eudes. The Praktikos and Chapters on Prayer. Cistercian Studies Series, vol. 4. Kalamazoo: Cistercian Publications, 1972.
Cassian, John. The Conferences of John Cassian. A Select Library of the Christian Church: Nicene and Pre-Nicene Fathers (Second Series), vol. XI: Sulpitius Severus, Vincent of Lerins, John Cassian. Translated by Edgar C. S. Gibson. New York: Christian Literature Company, 1894.
_____. The Institutes of John Cassian. A Select Library of the Christian Church: Nicene and Pre-Nicene Fathers (Second Series), vol. XI: Sulpitius Severus, Vincent of Lerins, John Cassian. Translated by Philip Schaff and Henry Wace. New York: Christian Literature Company, 1887.
_____. Institute 6, Conference 12, Conference 22. Cassian on Chastity. Translated by Terrence G. Kardong. Richardton, North Dakota: Assumption Abbey Press, 1993.
Evagrius. Antirrheticus. Translated Luke Dysinger and Michael O’Laughlin. Unpublished.
Palmer, G.E.H., Philip Sherrard and Kallistos Ware, ed./trans. The Philokalia: The Complete Text, vols. 1 and 2. Compiled by St. Nikodimos and St. Makarios. London: Faber and Faber, 1979 and 1981.
Sinkewicz, Robert E. Evagrius of Pontus: The Greek Ascetic Corpus. Oxford and New York: Oxford University Press, 2003.
Ward, Benedicta, trans. The Desert Fathers: Sayings of the Early Christian Monks. London: Penguis Books, 2003.