APA (7th ed.) Citation

Lewis, H. A. (2006). Hidden Treasures Or, Why Some Succeed While Others Fail. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lewis, Harry A. Hidden Treasures Or, Why Some Succeed While Others Fail. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Lewis, Harry A. Hidden Treasures Or, Why Some Succeed While Others Fail. Project Gutenberg, 2006.

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