CFC Exam Prep EPA Certification Exam Preparation Manual. 2006. 7th Edition. The ESCO Institute. ISBN: 1-930044-01-1 Air Conditioning Modern Refrigeration and Air Conditioning. 2017. Whitman, Johnson, Tomczyk, and Silberstein. 8th Edition. Cengage Learning. ISBN 13: 978-1-305-57829-6 Refrigeration Commercial Refrigeration and Air Conditioning for Air Conditioning Technicians. 2010. Dick Wirz. 2nd Edition. Cengage Learning. ISBN: 978-1-4283-3526-4 Heat Pumps Heat Pumps. 2016. Silberstein. 2nd Edition. Cengage Learning. ISBN: 978-1-305-08163-5