APA (7th ed.) Citation

Howes, R. V. (1920). American direct-fired coal ovens ideal for converting to gas. American Gas Engineering Journal., 113, 302.

Chicago Style (17th ed.) Citation

Howes, R. V. "American Direct-fired Coal Ovens Ideal for Converting to Gas." American Gas Engineering Journal. 113 (1920): 302.

MLA (9th ed.) Citation

Howes, R. V. "American Direct-fired Coal Ovens Ideal for Converting to Gas." American Gas Engineering Journal., vol. 113, 1920, p. 302.