Piotr Sula

1. SULA, Piotr. System partyjny Republiki Węgierskeij. Wrocĺaw: Wydawnictwo Uniwersytetu Wrocĺawskeigo, 2005. 160 str., preglednice. Acta Universitatis Wratislaviensis, no 2746. ISBN 83-229-2638-3. [COBISS.SI-ID 7927889]

2. SULA, Piotr. History written by the losers? Small parties in European governments 1990–2019. Journal of comparative politics. [Online ed.]. Jan. 2025, vol. 18, no. 1, str. 5-20, tabele. ISSN 1338-1385. https://www.jofcp.org/assets/jcp/Articles-2025/2025-11-Sula.pdf, Repository of the University of Ljubljana – RUL , http://www.dlib.si/details/URN:NBN:SI:doc-YL4YQ3T1. [COBISS.SI-ID 267896067]
project: Prvi osnutek tega dokumenta je bil razvit s finančno podporo Poljske nacionalne agencije za akademsko izmenjavo: PPN/BEK/2018/1/00332.