APA (7th ed.) Citation

Hartgen, F. A., & Smith, D. F. (1929). Temperatures for rapid self-heating of powdered coal and semicoke made therefrom. [publisher not identified].

Chicago Style (17th ed.) Citation

Hartgen, F. A., and David F. Smith. Temperatures for Rapid Self-heating of Powdered Coal and Semicoke Made Therefrom. Washington, D.C.: [publisher not identified], 1929.

MLA (9th ed.) Citation

Hartgen, F. A., and David F. Smith. Temperatures for Rapid Self-heating of Powdered Coal and Semicoke Made Therefrom. [publisher not identified], 1929.