Science and Technique
Rage: A Step-by-Step Guide to Overcoming Explosive Anger by Ronald Potter-Efron MSW PhD
The above book was the first one I worked with for my own rage and anger and was very helpful as a starting point.
Healing the Angry Brain: How Understanding the Way Your Brain Works Can Help You Control Anger and Aggression by Ronald Potter-Efron MSW PhD
This book follows the Rage book well and discusses more details about the brain, brain plasticity and setting new habits.
Why God Won’t Go Away: Brain Science and the Biology of Belief by Andrew Newberg, Eugene D’Aquili, and Vince Rause
A good layman’s book on how religion and the brain interact and how some mysticism works.
An attempt to look for positive psychological traits.
Heathenry and History
Barbarian Rites: The Spiritual World of the Vikings and the Germanic Tribes by Hans-Peter Hasenfratz Ph.D.
The Road to Hel: A Study of the Conception of the Dead in Old Norse Literature by Hilda Roderick Ellis Davidson (Note, the book was written in 1943 so more recent sources are better for a true scholar.)
Freya, Lady, Vanadis: An Introduction to the Goddess by Patricia M. Lafayllve
Book on the battle of Teutoberg Forest that stopped the Roman Empire and shaped Germanic and later cultures
BBC Web entry on Heathenry
Meditations by Marcus Aurelius (There are many translations, I would recommend several.)
Boxing and Fighting
Some sort of physical outlet is often important when dealing with rage and boxing has a long history. Here are a few books which might help:
Championship Fighting by Jack Dempsey
The Professor in the Cage by Jonathon Gottschall
A Man’s World by Donald McRae
Ghosts of Manila