APA (7th ed.) Citation

Viollet-le-Duc, E., & Bucknall, B. (2012). Annals of a Fortress. Project Gutenberg.

Chicago Style (17th ed.) Citation

Viollet-le-Duc, E., and Benjamin Bucknall. Annals of a Fortress. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Viollet-le-Duc, E., and Benjamin Bucknall. Annals of a Fortress. Project Gutenberg, 2012.

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