Start with high-confidence christian living books, then narrow by subgenre or adjacent topics.
Organic Church
Neil Cole, Leonard Sweet
One Size Doesn't Fit All
Gary L. McIntosh
Kingdom Calling
Amy L. Sherman
Revolution
George Barna
Calling in Context
Susan L. Maros
Your Calling Here and Now
Gordon T. Smith
Courage and Calling
The Healing Power of Essential Oils
Eric Zielinski DC, Eric Zielinski
Joyspan
Dr. Kerry Burnight Ph.D, Kerry Burnight
You Have a Calling
Karen Swallow Prior
Mystic Christianity
William Walker Atkinson
Yogi Ramacharaka, William Walker Atkinson
Large Catechism of Martin Luther
Martin Luther
