APA (7th ed.) Citation

Smyth, W. J. (2006). Mound-Builders. Project Gutenberg.

Chicago Style (17th ed.) Citation

Smyth, William J. Mound-Builders. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Smyth, William J. Mound-Builders. Project Gutenberg, 2006.

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