Start with high-confidence church administration books, then narrow by subgenre or adjacent topics.
Who Runs the Church?
Zondervan, Steven B. Cowan
The Multi-site Church Revolution
Geoff Surratt, Greg Ligon
The Strategically Small Church
Brandon J. O'Brien, Jim Belcher
Why Nobody Wants to Go to Church Anymore
Thom Schultz, Joani Schultz
One Size Doesn't Fit All
Gary L. McIntosh
Church Marketing 101
Richard L. Reising
Building Leaders
Aubrey Malphurs, Will Mancini
The In-between Church
Alice Mann