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
Beginning to Pray, by Anthony Bloom
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 and Orthodox Home, by Elissa Bjeletich and Caleb Shoemaker
Bringing Up Girls, by James Dobson
Bringing Up Boys, by James Dobson