APA (7th ed.) Citation

Smith, L. Y. (2012). The Romance of Aircraft. Project Gutenberg.

Chicago Style (17th ed.) Citation

Smith, Lawrence Yard. The Romance of Aircraft. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Smith, Lawrence Yard. The Romance of Aircraft. Project Gutenberg, 2012.

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