APA (7th ed.) Citation

Key, B. (2009). Recovering Heat From Chilled-Water Systems. Heating/Piping/Air Conditioning Engineering, 81(1), 28.

Chicago Style (17th ed.) Citation

Key, Brian. "Recovering Heat From Chilled-Water Systems." Heating/Piping/Air Conditioning Engineering 81, no. 1 (2009): 28.

MLA (9th ed.) Citation

Key, Brian. "Recovering Heat From Chilled-Water Systems." Heating/Piping/Air Conditioning Engineering, vol. 81, no. 1, 2009, p. 28.