- Author: Manhatton GMAT Prep
- Language: English
- Year: 2007
- Author: Prep Manhattan
- Language: English
- Author: Manhattan Prep (Firm)
- Language: English
- Year: 2014
- Author: Manhattan GMAT Prep
- Language: English
- Year: 2009
- Author: Manhattan GMAT Prep
- Language: English
- Year: 2009
- Author: Manhattan GMAT Prep
- Language: English
- Year: 2009
- Author: Manhattan GMAT Prep
- Language: English
- Year: 2009
- Author: Manhattan GMAT
- Language: English
- Year: 2009