APA (7th ed.) Citation

Wartman, F. S. (1931). Flotation tests on converter slag. [publisher not identified].

Chicago Style (17th ed.) Citation

Wartman, Frank S. Flotation Tests on Converter Slag. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Wartman, Frank S. Flotation Tests on Converter Slag. [publisher not identified], 1931.