- Author: Stirling Bruce
- Language: English
- Year: 2019
- Author: Stirling Bruce
- Language: English
- Year: 2016
- Author: Stafford-Yilmaz Lynn, Zwier Lawrence J
- Language: English
- Year: 2005
- Author: Matthiesen Steven J
- Language: English
- Year: 2017
- Author: Leong Elaine, Leong Kaiwen
- Language: English
- Year: 2016
- Author: Engelhardt Diane
- Language: English
- Year: 2015
- Author: Educational Testing Service. ETS
- Language: English
- Year: 2015
- Author: Educational Testing Service
- Language: English
- Year: 2016