APA (7th ed.) Citation

Leonard, W. A. (1928). Ventilating machinery for railroad tunnel in Poland required. [publisher not identified].

Chicago Style (17th ed.) Citation

Leonard, Walter A. Ventilating Machinery for Railroad Tunnel in Poland Required. Washington, D.C.: [publisher not identified], 1928.

MLA (9th ed.) Citation

Leonard, Walter A. Ventilating Machinery for Railroad Tunnel in Poland Required. [publisher not identified], 1928.

Warning: These citations may not always be 100% accurate.