APA (7th ed.) Citation

(2007). Cowboy Songs and Other Frontier Ballads. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cowboy Songs and Other Frontier Ballads. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Cowboy Songs and Other Frontier Ballads. Project Gutenberg, 2007.

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