1. Global Comparative Analysis of HFC and Alternative Technologies for Refrigeration, Air Conditioning, Foam, Solvent, Aerosol Propellant, and Fire Protection Applications. Final Report to the Alliance for Responsible Atmospheric Policy, August 23, 1999;A.D. Little, Inc (ADL),1999
2. ANSI/AHRI Standard 210/240 with addenda 1 and 2 standard for performance rating of unitary air-conditioning & air-source heat pump equipment;ANSI/AHRI Standard,2008
3. Standard 34 Designation and Safety Classification of Refrigerants;ASHRAE,2013