Thomas Keating, Open Mind, Open Heart. New York: Continuum, 2006.
This classic book by one of the founders of centering prayer provides a good introduction to centering prayer and has recently been revised in honor of its 20th anniversary.  Much of the book is in a practical question and answer format.

Thomas Keating, Invitation to Love: The Way of Christian Contemplation. Bloomsbury, 2012.
This book by one of the founders and great exponents of centering prayer explores the spiritual growth that takes place when centering prayer is seriously undertaken.

Cynthia Bourgeault, Centering Prayer and Inner Awakening. Cambridge, MA: Cowley, 2004.
Cynthia Bourgeault has worked closely with centering prayer founder Thomas Keating.  This book is an excellent guide for those who would like to go deeper into centering prayer.  It includes a good chapter on the welcoming prayer.

David Frenette, The Path of Centering Prayer: Deepening Your Experience of God. Boulder, CO: Sounds True, 2012.
David Frenette has taught Centering Prayer under Fr. Thomas Keating’s guidance since 1984.  This wonderful book provides a good introduction for beginners but also goes more deeply into the practice for the more experienced practitioner.  Includes chapters on the sacred breath, the sacred glance, and the sacred nothingness as well as the sacred word. 

David Frenette, Centering Prayer Meditations: Effortless Contemplation to Deepen Your Experience of God. Boulder, CO: Sounds True, 2014.
These meditations can be used to introduce a period of Centering Prayer, then paused for a period of silent prayer, then turned on again to end the session. It's a lovely way to frame a session if you have a little extra time, like being on a mini retreat.

Online Resources

Contemplative Outreach website
Contemplative Outreach is a great resource for more information on centering prayer, centering prayer weekly groups, and centering prayer retreats.

Download a brochure on centering prayer on the Contemplative Outreach website.

Centering Prayer for Seekers Facebook page, which provides news and updates on Contemplative Outreach of New York City groups and events.

Website for Cynthia Bourgeault, centering prayer teacher, prolific author, and leader in the contemplative movement.

Website for David Frenette, centering prayer teacher, author, and spiritual director.

Website for Lindsay Boyer, Contemplative Outreach of New York City coordinator, full of information about contemplative prayer practices, exploration of different faith traditions, digital spiritual practice, reading suggestions, and ways to stay grounded while pursuing spiritual growth.

Webpage for Phil Fox Rose, Contemplative Outreach of New York City co-coordinator, writer and editor.

An article on centering prayer in Patheos by Phil Fox Rose, Contemplative Outreach of New York City co-coordinator.

Practical tips on meditation by Phil Fox Rose, Contemplative Outreach of New York City co-coordinator.