APA (7th ed.) Citation

United States. National Advisory Committee for Aeronautics. (1939). Wind℗--tunnel investigation of N. A. C. A. 23012, 23021, and 23030 airfoils with various sizes of split flap. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Advisory Committee for Aeronautics. Wind℗--tunnel Investigation of N. A. C. A. 23012, 23021, and 23030 Airfoils with Various Sizes of Split Flap. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. National Advisory Committee for Aeronautics. Wind℗--tunnel Investigation of N. A. C. A. 23012, 23021, and 23030 Airfoils with Various Sizes of Split Flap. [s.n.], 1939.