APA (7th ed.) Citation

(1861). Circular: Parrott's rifled cannon. [publisher not identified].

Chicago Style (17th ed.) Citation

Circular: Parrott's Rifled Cannon. Washington, D.C.: [publisher not identified], 1861.

MLA (9th ed.) Citation

Circular: Parrott's Rifled Cannon. [publisher not identified], 1861.