- Author: Laura Schmidt Roberts, Paul Martens, Myron A. Penner
- Language: English
- Year: 2020
- Author: Chris Roberts Paul Stevens
- Language: English
- Year: 2021
- Author: Roberts Paul, Economist Newspaper Limited
- Language: English
- Year: 2013
- Author: Roberts Paul G
- Language: English
- Year: 2015
- Author: Roberts Paul G
- Language: English
- Year: 2014
- Author: Roberts Paul G
- Language: English
- Year: 2015
- Author: Roberts Paul Craig
- Language: English
- Year: 2015
- Author: Roberts Paul Craig
- Language: English
- Year: 2015
- Author: Roberts Paul G
- Language: English
- Year: 2015