- Author: Diễn đàn Box Math
- Language: Vietnamese
- Year: 2011
- Author: Math Noortmann, August Reinisch, Cedric Ryngaert (editors)
- Language: English
- Year: 2015
- Author: Math No Problem!
- Language: English
- Author: Math No Problem!
- Language: English
- Author: Math No Problem!
- Language: English