Ai, A..L. et al. (2005). "Prayer Coping, Positive Attitudes, and Cardiac Surgery" in Lee, A.V. Coping with Disease. Nova Science Publishers, Inc., pp. 23-64.
Auer, B. And J.A. Ang (2007). Torment of the Soul: Suicidal Depression and Spirituality. AuthorHouse.
Beck, A.T. And B.A. Alford (2009). Depression: Causes and Treatment. University of Pennsylvania Press.
Biebel, D.B. And H.G. Koenig (2010). New Light on Depression: Help, Hope and Answers for the Depressed and Those Who Love Them. Zondervan Publishing House.