APA (7th ed.) Citation

Vivian, E. C., & Marsh, W. L. (1997). A History of Aeronautics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Vivian, Evelyn Charles, and W. Lockwood Marsh. A History of Aeronautics. Project Gutenberg, 1997.

MLA (9th ed.) Citation

Vivian, Evelyn Charles, and W. Lockwood Marsh. A History of Aeronautics. Project Gutenberg, 1997.

Warning: These citations may not always be 100% accurate.