APA (7th ed.) Citation

Thorne, G. (2011). The City in the Clouds. Project Gutenberg.

Chicago Style (17th ed.) Citation

Thorne, Guy. The City in the Clouds. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Thorne, Guy. The City in the Clouds. Project Gutenberg, 2011.

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