APA (7th ed.) Citation

Miller, R., & Miller, M. R. HVAC licensing exam study guide.

Chicago Style (17th ed.) Citation

Miller, Rex, and Mark R. Miller. HVAC Licensing Exam Study Guide.

MLA (8th ed.) Citation

Miller, Rex, and Mark R. Miller. HVAC Licensing Exam Study Guide.

Warning: These citations may not always be 100% accurate.