APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1938). Scavenging piston℗--ported two-stroke cylinder. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Scavenging Piston℗--ported Two-stroke Cylinder. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Scavenging Piston℗--ported Two-stroke Cylinder. [s.n.], 1938.