- Author: W. B. Vasantha Kandasamy, Florentin Smarandache
- Language: English
- Year: 2006
- Author: W. B. Vasantha Kandasamy Florentin Smarandache K. Ilanthenral
- Language: English
- Year: 2010
- Author: Florentin Smarandache Salah Osman Muhammad Tawfiq Al-Dawi
- Language: Arabic
- Year: 2007
- Author: Florentin Smarandache
- Language: Romanian
- Year: 1999
- Author: (美) 弗罗仁汀·司马仁达齐 (中) 江正杰 (Florentin Smarandache Jiang Zhengjie)
- Language: Chinese
- Year: 2008
- Author: Florentin Smarandache Constantin Dumitrescu
- Language: Romanian
- Year: 1995
- Author: Florentin Smarandache
- Language: English
- Year: 2000
- Author: Florentin Smarandache W. B. Vasantha Kandasamy
- Language: English
- Year: 2006
- Author: edited by Fu Yuhua Florentin Smarandache V. Christianto
- Language: English
- Year: 2009