Richard Foster:  Celebration of Discipline; Devotional Classics; Spiritual Classics; Spiritual Direction; Life with God

Gerald May:  Addiction & Grace; The Dark Night of the Soul

Marjorie Thompson:  Soul Feast

John Piper:  Desiring God

C. S. Lewis:  Mere Christianity

Timothy M. Gallagher:  The Discernment of Spirits; An Ignatian Introduction to Prayer; Spiritual Consolation