***This is the best all-around work:
Depression: Looking Up from the Stubborn Darkness by Ed Welch
This is a small booklet based on the above book (you can even download sample pages in PDF form from this one): Depression: The Way Up When You Are Down (RCL Booklet) (CCEF)
This deals with the brain as a factor in these discussions ... or not (sample of this one available as well): Blame It on the Brain by Ed Welch
I include this one on feelings as well: Feelings and Faith: Cultivating Godly Emotions in the Christian Life by Brian Borgman Please let me know if you know of any others!
PS - Here are a few helpful articles as well ...
Psychotropic Medications: In Search of a Biblical Context by W.P. "Ab" Abercrombie
Elijah’s “Depression” by Jay Adams