1. AIS Model 100 Precinct Ballot Scanner Operator’s Manual, Version Release 2.1, American Information Systems (August 1997)
2. Ballot Now Intelligent Ballot Management, Hart InterCivic (2005)
3. The Electoral Act of 1856, Victoria, Australia (1856)
4. Procedures at a General Election, British Department for Constitutional Affairs, August 17, 2001. Paragraphs 11.14 through 11.18 (2001)
5. Official Ballot General Election, Clay County Iowa, November 7 (2000)