APA (7th ed.) Citation

Fahrenwald, A. W. (1925). Present status of differential flotation. [publisher not identified].

Chicago Style (17th ed.) Citation

Fahrenwald, A. W. Present Status of Differential Flotation. Washington, D.C.: [publisher not identified], 1925.

MLA (9th ed.) Citation

Fahrenwald, A. W. Present Status of Differential Flotation. [publisher not identified], 1925.