- Author: International IDEA
- Language: English
- Year: 2015
- Author: Markus Böckenförde Nora Hedling Winluck Wahiu
- Language: English
- Year: 2011
- Author: International IDEA Priscilla B. Hayner Stef Vandeginste Brandon Hamber
- Language: English
- Year: 2003
- Author: Peter Harris Ben Reilly Mark Anstey
- Language: English
- Year: 1998