APA (7th ed.) Citation

Howard, R. E. (2013). The People of the Black Circle. Project Gutenberg.

Chicago Style (17th ed.) Citation

Howard, Robert E. The People of the Black Circle. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Howard, Robert E. The People of the Black Circle. Project Gutenberg, 2013.

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