APA (7th ed.) Citation

American Gas Association. (1975). Gas heating controls service manual (1976 ed.). American Gas Association.

Chicago Style (17th ed.) Citation

American Gas Association. Gas Heating Controls Service Manual. 1976 ed. Arlington, Va.: American Gas Association, 1975.

MLA (9th ed.) Citation

American Gas Association. Gas Heating Controls Service Manual. 1976 ed. American Gas Association, 1975.