
- Author: Orison Swett Marden
- Language: English
- Year: 1908

- Author: Thomas Albert Dickinson
- Language: English
- Year: 1943

- Author: Anne Ophelia Dowden
- Language: English
- Year: 1975

- Author: William Elliot Griffis
- Language: English
- Year: 1919

- Author: William Elliot Griffis
- Language: English
- Year: 1921