APA (7th ed.) Citation

(1941). The Elliptic Wing Based on the Potential Theory. [s.n.].

Chicago Style (17th ed.) Citation

The Elliptic Wing Based on the Potential Theory. [Washington]: [s.n.], 1941.

MLA (9th ed.) Citation

The Elliptic Wing Based on the Potential Theory. [s.n.], 1941.