The following technical references are encouraged for the prep class, but not mandatory. Keep in mind, these are the same references that you will be able to bring with you for the actual journeyman license exam. A good place to purchase these references is on Amazon.com or you may be able to borrow them from an employer or friend. Plan to register for the journeyman exam soon after you complete this prep class.
Modern Refrigeration and Air Conditioning, Althouse, Turnquist, Bracciano, 18th Ed, Goodheart-Willcox, ISBN-13: 9781590702802
International Mechanical Code, 2009, International Code Council, 5203 Leesburg Pike, Suite 600, Falls Church, VA 22041, (800) 786-4452, ISBN-13: 9781580017312 NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2006 (or more recent version), National Fire Protection Association, 11 Tracy Drive, Avon, MA 02322; ISBN 9781616651909