APA (7th ed.) Citation

Harding, L. A. (1935). Why air conditioning bids vary. Heating/Piping/Air Conditioning., 7, 317.

Chicago Style (17th ed.) Citation

Harding, L. A. "Why Air Conditioning Bids Vary." Heating/Piping/Air Conditioning. 7 (1935): 317.

MLA (9th ed.) Citation

Harding, L. A. "Why Air Conditioning Bids Vary." Heating/Piping/Air Conditioning., vol. 7, 1935, p. 317.

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