APA (7th ed.) Citation

Mencken, H. L. (2006). A Book of Prefaces. Project Gutenberg.

Chicago Style (17th ed.) Citation

Mencken, H. L. A Book of Prefaces. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Mencken, H. L. A Book of Prefaces. Project Gutenberg, 2006.

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