APA (7th ed.) Citation

Sinclair, U. (2011). On Guard: Mark Mallory's Celebration. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sinclair, Upton. On Guard: Mark Mallory's Celebration. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Sinclair, Upton. On Guard: Mark Mallory's Celebration. Project Gutenberg, 2011.

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