APA (7th ed.) Citation

Sikorsky Manufacturing Corporation & United States. National Advisory Committee for Aeronautics. (1928). The Sikorsky twin-engined amphibian type S-38 model 1928. National Advisory Committee for Aeronautics.

Chicago Style (17th ed.) Citation

Sikorsky Manufacturing Corporation and United States. National Advisory Committee for Aeronautics. The Sikorsky Twin-engined Amphibian Type S-38 Model 1928. Washington, [D.C.]: National Advisory Committee for Aeronautics, 1928.

MLA (9th ed.) Citation

Sikorsky Manufacturing Corporation and United States. National Advisory Committee for Aeronautics. The Sikorsky Twin-engined Amphibian Type S-38 Model 1928. National Advisory Committee for Aeronautics, 1928.