APA-referens (7:e uppl.)

Bértona, F. C., & Guerra, S. Earthquake or hurricane?: The rise and fall of populist parties in Poland. Absorbing the blow : populist parties and their impact on parties and party systems.

Chicago-referens (17:e uppl.)

Bértona, Fernando Casal, och Simona Guerra. "Earthquake or Hurricane?: The Rise and Fall of Populist Parties in Poland." Absorbing the Blow : Populist Parties and Their Impact on Parties and Party Systems .

MLA-referens (8:e uppl.)

Bértona, Fernando Casal, och Simona Guerra. "Earthquake or Hurricane?: The Rise and Fall of Populist Parties in Poland." Absorbing the Blow : Populist Parties and Their Impact on Parties and Party Systems, .