To begin your reading in the Scriptures, it is highly recommended to use the Orthodox Study Bible, which provides quotations and commentaries from the Early Church Fathers.
Thirsting for God in a Land of Shallow Wells, by Matthew Gallatin
INTRODUCTION TO THE COPTIC ORTHODOX CHURCH, by Fr. Tadros Malaty
Orthodox Thought and Instruction: In the Orthodox Church, by Fr. Tadros Malaty
THE ORTHODOX CONCEPT: TRADITION AND ORTHODOXY, by Fr. Tadros Malaty
THE SEVEN SACRAMENTS: The Catechism of the Coptic Orthodox Church - Book III, by Fr. Tadros Malaty
COPTIC CHRISTOLOGY PAST AND PRESENT, by Fr. Tadros Malaty
GOD: The Coptic Orthodox Church & The Dogmas, by Fr. Tadros Malaty
THE COPTIC ORTHODOX CHURCH & THE DOGMAS: ALEXANDRIA AND CHRISTIAN DOGMAS, by Fr. Tadros Malaty
Theology Series (Free PDFs)
The Orthodox Faith (Free PDF) - compilation of writings by the SUS Diocese. Topics include Holy Tradition, Theology, Christology, and other topics
Becoming Orthodox: A Journey to the Ancient Christian Faith, by Fr. Peter Gillquist
Two Thousand Years of Coptic Christianity, by Otto F.A. Meinardus
For the Life of the World: Sacraments and Orthodoxy, by Alexander Schmemann
The Inner Kingdom, by Bishop Kallistos Ware
The Faith: Understanding Orthodox Christianity, by Clark Carlton
The Orthodox Church, by Timothy Ware
Guidelines for Prayer, Fr. Matthew the Poor
Words for Our Lives, Fr. Matthew the Poor
Beginning to Pray, by Anthony Bloom
Our Thoughts Determine Our Lives: The Life and Teachings of Elder Thaddeus of Vitovnica
Orthodox Prayer Life: The Interior Way, by Matthew the Poor
Preserve them, O Lord, by Father John Mack
Two Become One: An Orthodox Christian Guide to Engagement and Marriage, by Father Antonios Kaldas
Parenting Toward the Kingdom, Orthodox Principles of Child-Rearing, by Philip Mamalakis
Blueprints for the Little Church: Creating an Orthodox Home, by Elissa Bjeletich and Caleb Shoemaker
Bringing Up Girls, by James Dobson
Bringing Up Boys, by James Dobson