APA (7th ed.) Citation

Koopman, H. L. (2007). The Booklover and His Books. Project Gutenberg.

Chicago Style (17th ed.) Citation

Koopman, Harry Lyman. The Booklover and His Books. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Koopman, Harry Lyman. The Booklover and His Books. Project Gutenberg, 2007.

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