This list is based on Fr Pius X Harding's Recommended Reading list for Oblates at Mount Angel Abbey, with a few adaptions and additions of my own.
Christ the Ideal of the Monk
Blessed Columba Marmion, OSB, McC Publishing, Ridgefield, CT
A Life Pleasing to God - The Spiritualaity of the Rules of Saint Basil
Augustine Holmes, OSB, Cistercian Publications, Kalamazoo, MI
Spiritual Letters of Dom John Chapman
Seeking God
Esther de Waal, The Liturgical Press, Collegeville, MN
A Life-Giving Way
Esther de Waal, The Liturgical Press, Collegeville, MN
Living With Contradiction
Esther de Waal, Morehouse Publishing, Harrisburg, PA
Perspectives on the Rule of Saint Benedict
Aquinata Bockmann, OSB, The Liturgical Press, Collegeville, MN
Around the Monastic Table
Aquinata Bockmann, OSB, The Liturgical Press, Collegeville, MN
Strangers to the City
Michael Casey, OCSO, Paraclete Press, Brewster, MA
Toward God
Michael Casey, OCSO, Paraclete Press, Brewster MA
An Unexciting Life
Michael Casey, OCSO, St. Bede's Publications, Petersham, MA
Intoducing Benedict's Rule
Michael Casey & David Tomlins, EOS Verlag Erzabtai St. Ottilien, Germany
The Monastic Journey
Thomas Merton, Cistercian Publications, Kalamazoo, MI
The Life and Miracles of Saint Benedict
Pope Saint Gregory the Great, The Liturgical Press, Collegeville, MN
Essential Monastic Wisdom
Hugh Feiss, OSB, Harper Collins, NY
Holy Work, Towards a Benedictine Theology of Manual Labor
Rembert Sorg, OSB, Source Books, Santa Anna, CA
The Rule Of Saint Benedict, ADoctrinal and Spiritual Commentary
Adalbert de Vogüé, OSB, Cistercian Publications, Kalamazoo, MI
Reading Saint Benedict, reflections on the Rule
Adalbert de Vogüé, OSB, Cistercian Publications, Kalamazoo, MI
Lovers of the Place
Francis Kline, OCSO, The Liturgical Press, Collegeville, MN