HVAC/R Terminology: A Quick Reference Guide by Richard Wirtz

HVAC Trainee Guide, Level 1 - Paperback, by NCCER - Acceptable

EMS Terminology: A Quickstudy Laminated Reference Guide by Barcharts Publishing

HVAC/R TERMINOLOGY: A QUICK REFERENCE GUIDE (SECOND By Richard Wirtz

HVAC Trainee Guide, Level 3 - Paperback, by NCCER - Good

Answer an HVAC & R Reference Guide Luxaire Heating & Cooling Esco Press 2000

HVAC Trainee Guide, Level 4 - Paperback, by NCCER - Good