APA (7th ed.) Citation

Hough, E. (2002). The Passing of the Frontier: A Chronicle of the Old West. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hough, Emerson. The Passing of the Frontier: A Chronicle of the Old West. Project Gutenberg, 2002.

MLA (9th ed.) Citation

Hough, Emerson. The Passing of the Frontier: A Chronicle of the Old West. Project Gutenberg, 2002.

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