Start with high-confidence respiratory therapy books, then narrow by subgenre or adjacent topics.
Breathing Lessons
MeiLan K. Han M. D.
The COPD Solution
Dawn Lesley Fielding
Breath Taking
Michael J. Stephen
Positive Options for Living With COPD
Teri Allen
THE BREATHING CURE
Patrick McKeown, Laird Hamilton
The Air Self-care Handbook
Melissa Wrolstad
Guide to Pulmonary Fibrosis & Interstitial Lung Diseases
Noah Greenspan PT DPT CCS EMT-B, Robert Kaner MD
The Respiratory Solution
Dr. Cass Ingram, Cass Ingram
What You Need to Know About Asthma
Evelyn B. Kelly