APA (7th ed.) Citation

Chapin, E. H. (2008). Humanity in the City. Project Gutenberg.

Chicago Style (17th ed.) Citation

Chapin, E. H. Humanity in the City. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Chapin, E. H. Humanity in the City. Project Gutenberg, 2008.

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