Gaya APA

levenhagen, J, I., spethmann, D, H. (1993). HVAC Controls and Systems / John i Levenhagen (Edisi 1 Jilid 1). Singapore: McGraw-Hill Book Company.

Gaya MLA

levenhagen, John, I.., spethmann, Donald, H.. "HVAC Controls and Systems / John i Levenhagen". Edisi 1 Jilid 1 Singapore: McGraw-Hill Book Company, 1993. Text.