APA (7th ed.) Citation

Parsons, F. (2011). The World's Best Books: A Key to the Treasures of Literature. Project Gutenberg.

Chicago Style (17th ed.) Citation

Parsons, Frank. The World's Best Books: A Key to the Treasures of Literature. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Parsons, Frank. The World's Best Books: A Key to the Treasures of Literature. Project Gutenberg, 2011.

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