APA (7th ed.) Citation

Curry, S. S. (2007). How to Add Ten Years to your Life and to Double Its Satisfactions. Project Gutenberg.

Chicago Style (17th ed.) Citation

Curry, S. S. How to Add Ten Years to Your Life and to Double Its Satisfactions. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Curry, S. S. How to Add Ten Years to Your Life and to Double Its Satisfactions. Project Gutenberg, 2007.

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