APA (7th ed.) Citation

Partridge, L. J. (1976). Coal-based ammonia plant operation. Chemical Engineering Progress, 72, 57.

Chicago Style (17th ed.) Citation

Partridge, L. J. "Coal-based Ammonia Plant Operation." Chemical Engineering Progress 72 (1976): 57.

MLA (9th ed.) Citation

Partridge, L. J. "Coal-based Ammonia Plant Operation." Chemical Engineering Progress, vol. 72, 1976, p. 57.