United States. National Advisory Committee for Aeronautics. (1936). Aerodynamic characteristics of N. A. C. A. 23012 and 23021 airfoils with 20-percent-chord external-airfoil flaps of N. A. C. A. 23012 section. [s.n.].
Chicago Style (17th ed.) CitationUnited States. National Advisory Committee for Aeronautics. Aerodynamic Characteristics of N. A. C. A. 23012 and 23021 Airfoils with 20-percent-chord External-airfoil Flaps of N. A. C. A. 23012 Section. [Washington]: [s.n.], 1936.
MLA (9th ed.) CitationUnited States. National Advisory Committee for Aeronautics. Aerodynamic Characteristics of N. A. C. A. 23012 and 23021 Airfoils with 20-percent-chord External-airfoil Flaps of N. A. C. A. 23012 Section. [s.n.], 1936.
Warning: These citations may not always be 100% accurate.