Levenhagen John I. & Spethmann Donald H. (1993). HVAC controls and systems. McGraw-Hill.
Chicago Style (17th ed.) CitationLevenhagen John I. and Spethmann Donald H. HVAC Controls and Systems. McGraw-Hill, 1993.
MLA (8th ed.) CitationLevenhagen John I. and Spethmann Donald H. HVAC Controls and Systems. McGraw-Hill, 1993.
Warning: These citations may not always be 100% accurate.