APA (7th ed.) Citation

Riis, J. A. (2009). The Battle with the Slum. Project Gutenberg.

Chicago Style (17th ed.) Citation

Riis, Jacob A. The Battle with the Slum. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Riis, Jacob A. The Battle with the Slum. Project Gutenberg, 2009.

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