APA (7th ed.) Citation

Helba, S. (2004). ASE heating and air conditioning (unit VII). Pearson Prentice Hall.

Chicago Style (17th ed.) Citation

Helba, Stephen. ASE Heating and Air Conditioning (unit VII). Upper Saddle River, NJ: Pearson Prentice Hall, 2004.

MLA (9th ed.) Citation

Helba, Stephen. ASE Heating and Air Conditioning (unit VII). Pearson Prentice Hall, 2004.