APA (7th ed.) Citation

Chatrian, A., & Erckmann, E. (2011). The Invasion of France in 1814. Project Gutenberg.

Chicago Style (17th ed.) Citation

Chatrian, Alexandre, and Émile Erckmann. The Invasion of France in 1814. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Chatrian, Alexandre, and Émile Erckmann. The Invasion of France in 1814. Project Gutenberg, 2011.

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