APA (7th ed.) Citation

Claxton, W. J. (1997). The Mastery of the Air. Project Gutenberg.

Chicago Style (17th ed.) Citation

Claxton, William J. The Mastery of the Air. Project Gutenberg, 1997.

MLA (9th ed.) Citation

Claxton, William J. The Mastery of the Air. Project Gutenberg, 1997.

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