APA (7th ed.) Citation

(1926). Engines and parts: D-12 type, safetying of plugs. [publisher not identified].

Chicago Style (17th ed.) Citation

Engines and Parts: D-12 Type, Safetying of Plugs. [Washington]: [publisher not identified], 1926.

MLA (9th ed.) Citation

Engines and Parts: D-12 Type, Safetying of Plugs. [publisher not identified], 1926.