Explains this voting procedure. Includes comparisons with alternative electoral systems.

Browse comparative constitutional and electoral laws, data, and other resources from countries in the Americas. In English and Spanish.

Exists to nurture, sustain and promote democracy around the world. Find news, forums, publications and press releases.

Find general and country-specific links to elections and voting systems around the world.

UC San Diego research collection gives district-level results for approximately 350 national legislative elections in 26 countries.

Encyclopedia snippet explains this political system, espoused in the United States, and contributes historical details.

Australian-based advocacy group offers materials on proportional representation and the Australian political system.