APA (7th ed.) Citation

Harper, H. H. (2007). Book-Lovers, Bibliomaniacs and Book Clubs. Project Gutenberg.

Chicago Style (17th ed.) Citation

Harper, Henry Howard. Book-Lovers, Bibliomaniacs and Book Clubs. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Harper, Henry Howard. Book-Lovers, Bibliomaniacs and Book Clubs. Project Gutenberg, 2007.

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