APA (7th ed.) Citation

Berger, L. B., McCaa, G. S., & Yant, W. P. (1930). New flame safety-lamp testing and demonstration apparatus. [publisher not identified].

Chicago Style (17th ed.) Citation

Berger, L. B., George S. McCaa, and W. P. Yant. New Flame Safety-lamp Testing and Demonstration Apparatus. Washington, D.C.: [publisher not identified], 1930.

MLA (9th ed.) Citation

Berger, L. B., et al. New Flame Safety-lamp Testing and Demonstration Apparatus. [publisher not identified], 1930.