St. Francis de Sales, Introduction to the Devout Life
(there are many editions—a good one is translated w/ introduction/notes by John K. Ryan. New York; Doubleday Image Book, 2003.)

Francis de Sales: Introduction to the Devout Life and Treatise on the Love of God
The Crossroad Spiritual Legacy Series.  Wright, Wendy M. New York: Crossroad, 1993.

St. Francis de Sales, Selected Letters
Translated, with introduction by Elizabeth Stopp. London: Faber & Faber/New York: Harper, 1960.

The Sermons of St. Francis de Sales on Prayer
Edited by Lewis S. Fiorelli, translated by the Nuns of the Visitation [Frances Therese Leary], with a preface by Fr. M. Basil Pennington, and introduction by Canon Henry Benedict Mackey. Sermons of St. Francis de Sales, vol. 1. Rockford, Ill.: Tan Books, 1985.

St. Francis de Sales: A Testimony by St. Jane de Chantal
Newly edited in translation with an introduction by Elisabeth Stopp. London: Faber, 1967.