APA (7th ed.) Citation

United States. Army. Ordnance Department. (1893). Army gun factory comparator, manufactured at Watertown Arsenal, Mass. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Ordnance Department. Army Gun Factory Comparator, Manufactured at Watertown Arsenal, Mass. [Washington]: [publisher not identified], 1893.

MLA (9th ed.) Citation

United States. Army. Ordnance Department. Army Gun Factory Comparator, Manufactured at Watertown Arsenal, Mass. [publisher not identified], 1893.

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