http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
vol. 1. Social-political models -- vol. 2. Cognition and the voter calculus -- vol. 3. Forecasting and electoral context -- vol. 4. Debates and methodology
edited by Kai Arzheimer and Jocelyn Evans.