van Biezen, I. (2013, May 6). The decline in party membership across Europe means that political parties need to reconsider how they engage with the electorate [Blog post]. Retrieved from van Biezen, I., Mair, P., & Poguntke, T. (2012). Going, going… gone? The decline of party membership in contemporary Europe. European Journal of Political Research, 51(1), 24–56. Blumler, J. (2013). The fourth age of political communication. Retrieved from Brodzińska-Mirowska, B. (2013). Marketing międzywyborczy w teorii i praktyce. Przypadek Platformy Obywatelskiej. Toruń: Wydawnictwo UMK. Brodzińska-Mirowska, B. (2014). Unfulfilled expectations(?) Political communication on the Internet in the era of professionalization. E-politicon, 9, 43–64. Brodzińska-Mirowska, B. (2018). Porażka wyborcza w dobie profesjonalizacji komunikacji politycznej. In A. Pacześniak, Anatomia porażki wyborczej (pp. 39–63). Warszawa: Wydawnictwo Sejmowe. Cabrera, E., Ortega, J., and Cabrera, Á. (2003). An exploration of the factors that influence employee participation in Europe. Journal of World Business, 38(1), 43–54. Creswell, J. W. (2003). Research Design. Qualitative, Quantitative and Mixed Methods Approaches. London: Sage. Cross, W., & Gauja, A. (2014). Evolving membership strategies in Australian political parties. Australian Journal of Political Science, 49(4), 611–625. Cybulska, A., & Pankowski, K. (2017, September 15). Ogólny stosunek do partii politycznych (CBOS Raport z badań, nr 66/2017). Retrived from Dutch political party membership edges up, but not for all (2017, December 30). Dutch News. Retrieved from Gauja, A. (2017). Party Reform. The causes, challenges and consequences of organizational change. Oxford: Oxford University Press. Gauja, A., & Jackson, S. 2016. Australian Greens party members and supporters: their profiles and activities. Environmental Politics, 25(2), 359–379. Gerber, A., & Green, D. (2000). The Effects on Canvassing, Telephone Calls, and Direct Mail on Voter Turnout. American Political Science Review, 94(3), 653–663. Gibson, R., & Römmele, A. (2009). Measuring the Professionalization of Political Campaigning. Party Politics, 15(3), 265–293. Grunig, J. E. (2006), Furnishing the Edifice: Ongoing Research on Public Relations as a Strategic Management Function. Journal of Public Relations, 18(2), 151–176. Grunig, J. E. (2009). Paradigms of Global Public Relations in an Age of Digitalization. PRism, 6(2), 1–19. van Haute, E., & Gauja, A. (2015). Introduction: party members and activism. In E. van Haute & A. Gauja, Party Members and Activists (pp. 1–16). London: Routledge. Holtz-Bacha, C. (2007). Professionalization of politics in Germany. In R. Negrine, P. Mancini, Ch. Hotlz--Bacha, & S. Papathanassopoulos, The professionalization of political communication (pp. 63–80). Bristol: Intellect. Lees-Marshment, J., & Pettitt, R. T. (2014). Mobilising volunteer activists in political parties: the view from central office. Contemporary Politics, 20(2), 246–260. Liberal Party. (2009). Advancing Change Together: A Time to Act. Retrieved from Lilleker, D., & Negrine, R. (2002). Professionalization: of What? Since When? by Whom? The Harvard International Journal of Press/Politics’, 7(4), 98–103. Katz, R. S., & Mair, P. (1993). The evolution of party organizations in Europe: the three faces of party organization. American review of politics, 14(4), 593–617. Kopecký, P. (1995). Developing party organization in East-Central Europe. What type of party is likely to emerge? Party Politics, 1(4), 515–534. Kölln, A. K. (2015). The effects of membership decline on party organisations in Europe. European Journal of Political Research, 54(4), 707–725. Kroet, C. (2017, August 3). Geert Wilders’ far-right party suffers donation downturn. Politico. Retrieved from Mair, P., & van Biezen, I. (2001). Party membership in twenty European Democracies 1980–2000. Party Politics, 7(1), 5–21. Materska-Sosnowska, A. (2013). Partie w kryzysie. In A. Pacześniak & M. Wincławska, Partie polityczne w Polsce i w Europie. Struktury, funkcje, strategie w zmieniającym się otoczeniu (pp. 345–356). Wrocław-Toruń: Echo. Mjelde, L. H. (2013). How and why parties respond to membership decline: The case of the SPD and the CDU. German Politics, 22(3), 253–269. Römmele, A. (2003). Political parties, party communication and new information and communication technologies. Party Politics, 9(1), 7–20. Scarrow, S. (2002). Parties without members? Party organization in a Changing Electoral Environment. In D. Russell & M. Wattenberg, Parties without partisans. Political change in advanced industrial democracies (pp. 79–101). Oxford: Oxford University Press. Scarrow, S. (2010). Aktywność polityczna i członkostwo partyjne. In D. Russell & H. D. Klingemann, Zachowania polityczne. Vol. 2 (pp. 257–280). Warszawa: PWN. Scarrow, S. (2015). Beyond party members. Changing approaches to partisan mobilisation. Oxford: Oxford University Press. Scarrow, S. (2018). Changing Opportunities for Partisan Participation: Belonging, Doing and/or Deciding. Paper presented at the seminar How Parties Organize: The Polish Case in International Perspective. Tavits, M. (2013). Post-Communist Democracies and the Party Organizations. Cambridge: Cambridge University Press. Úsvit přímé demokracie. (2013, November 22). Aktuálně. Retrieved from Whiteley, P. (2009). Where have all the members gone? The dynamics of party membership in Britain. Parliamentary Affairs, 62(2), 242–257. Whiteley, P. (2011). Is the party over? The decline of party activism and membership across the democratic world. Party Politics, 17(1), 21–44. Whiteley, P., Seyd, P., & Billinghurst, A. (2006). Third force politics: Liberal Democrats at the grassroots. Oxford: Oxford University Press. Wincławska, M. (2010). Unia Wolności. Partia Polityczna w okresie transformacji. Warszawa: Scholar. Wincławska, M. (Ed.). (2013). Partie polityczne w początkach XXI wieku. Problemy rozwoju, organizacji i funkcjonowania. Toruń: Wydawnictwo UMK. Wincławska, M. & Brodzińska-Mirowska, B. (2016). Niewykorzystane szanse? Polskie partie polityczne w działaniu. Toruń: Wydawnictwo UMK.