APA (7th ed.) Citation

Hobbs, L. S. (2012). The Wright Brothers' Engines and Their Design. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hobbs, Leonard S. The Wright Brothers' Engines and Their Design. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Hobbs, Leonard S. The Wright Brothers' Engines and Their Design. Project Gutenberg, 2012.

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