Benner, David G. Sacred Companions: The Gift of Spiritual Friendship & Direction. Downers Grove, IL: InterVarsity Press, 2004.

Crabb, Larry. Soultalk: Speaking with Power Into the Lives of Others. Nashville: Thomas Nelson, 2003.

Crabb, Larry. The Safest Place on Earth: Where People Connect and Are Forever Changed. Nashville, Tennessee: Word Publishing, 1999