APA (7th ed.) Citation

Gilbert, G., & Collins, W. W. (2010). Cathedral Cities of England. Project Gutenberg.

Chicago Style (17th ed.) Citation

Gilbert, George, and W. W. Collins. Cathedral Cities of England. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Gilbert, George, and W. W. Collins. Cathedral Cities of England. Project Gutenberg, 2010.

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