APA (7th ed.) Citation

Marshall, H., & Marshall, H. (2012). Cathedral Cities of France. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marshall, Herbert, and Hester Marshall. Cathedral Cities of France. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Marshall, Herbert, and Hester Marshall. Cathedral Cities of France. Project Gutenberg, 2012.

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