- Author: Roberts Paul, Economist Newspaper Limited
- Language: English
- Year: 2013
- Author: La Guardia Anton, Peet John
- Language: English
- Year: 2014
- Author: Driessen Michel, Faelten Anna, Moeller Scott
- Language: English
- Year: 2016
- Author: Economist Books., Merson Rupert
- Language: English
- Year: 2014
- Author: Economist Newspaper Limited., Bain Caroline
- Language: English
- Year: 2013
- Author: Economist Books., Merson Rupert
- Language: English
- Year: 2014
- Author: Merson Rupert
- Language: English
- Year: 2014