Hegedüs, Daniel; Boros, Tamás; Bartha, Dániel; Cuperus, René; Győri, Gábor; Laki, Gergely; Soós, Eszter Petronella (2017). The State of Populism in Europe 2017. Foundation for European Progressive Studies, Policy Solutions, Friedrich-Ebert-Stiftung Budapest. p. 44. ISBN9782930769103. Retrieved June 19, 2018.
Hegedüs, Daniel; Boros, Tamás; Bartha, Dániel; Cuperus, René; Győri, Gábor; Laki, Gergely; Soós, Eszter Petronella (2017). The State of Populism in Europe 2017. Foundation for European Progressive Studies, Policy Solutions, Friedrich-Ebert-Stiftung Budapest. p. 44. ISBN9782930769103. Retrieved June 19, 2018.
Zulianello, Mattia; Larsen, Erik Gahner (June 2021). "Populist parties in European Parliament elections: A new dataset on left, right and valence populism from 1979 to 2019". Electoral Studies. 71 (1): 10–12. doi:10.1016/j.electstud.2021.102312. ISSN0261-3794.
Zulianello, Mattia; Larsen, Erik Gahner (June 2021). "Populist parties in European Parliament elections: A new dataset on left, right and valence populism from 1979 to 2019". Electoral Studies. 71 (1): 10–12. doi:10.1016/j.electstud.2021.102312. ISSN0261-3794.