Ager A., Strang A. (2004), Indicators of Integration. Final Report, Home Office, London

Alba R., Nee V. (2003), Remaking the American Mainstream. Assimilation and Contemporary Immigration, Harvard University Press, Cambridge–London

Baubock R. (1999), National Community, Citizenship and Cultural Diversity, Institute for Advanced Studies, Vienna

Bauman Z. (1998), Globalization: The Human Consequences, Columbia University Press, New York

Beck U. (1992), Risk Society: Towards a New Modernity, Sage Publications, London

Berry J.W. (1997), Immigration, Acculturation and Adaptation, “Applied Psychology: An International Review” Vol. 46, No. 1

Blomeraad I., Korteweg A., Yurdakul G. (2008), Citizenship and Immigration: Multiculturalism, Assmililation, and Challenges to the Nation-State, “Annual Review of Sociology” Vol. 34

Bukowska X., Wnuk-Lipiński E. (2009), Obywatelskość a la polonaise – czyli jakimi obywatelami są Polacy [Citizenship a la Polonaise – What Citizens Poles Are?], „Nauka” No. 1

Castles S., Davidson A. (2000), Citizenship and Migration. Globalization and politics of belonging, Routledge, New York

Castles S., Korac M., Vasta E., Vertovec S. (2002), Integration: mapping the field, Report of a Project carried out by the University of Oxford Centre for Migration and policy Research and Refugee Studies Centre contracted by the Home Office Immigration Research and Statistics Service, Oxford

Esser H. (2010), Assimilation, Ethnic Stratification, or Selective Acculturation? Recent Theories of the Integration of Immigrants and the Model of Intergenerational Integration, „Sociologica”, Fascicolo 1, DOI: 10.2383/32055

Glazer N. (1993), Is assimilation dead?, “The Annals of the American Academy of Political and Social Science” Vol. 530

Gordon M. (1964), Assimilation in American Life, Oxford University Press, New York

Grzymała-Kazłowska A. (2008), Integracja – próba rekonstrukcji pojęcia [Integration – an attempt to reconstruct the concept], (in:) Problemy integracji imigrantów. Koncepcje, badania, polityki [Problems of immigrant integration. Concepts, research, policies], (Eds.) Grzymała-Kazłowska A., Łodziński S., Wydawnictwo Uniwersytetu Warszawskiego, Warszawa

Henley & Partners (2016), Visa Restriction Index, https://www.henley-global.com/files/download/HP/hvri/HP%20Visa%20Restrictions%20Index%20160223.pdf 

Icelandic Nationality Act (1952), No. 100/1952 (23 December), https://www.legislationline.org/documents/id/5320 

Jóhannesson G.T., Petursson G.T., Bjornsson T. (2013), Country report: Ice-land, EDUO Citizneship Observatory, Robert Schuman Centre for Advanced Studies, European University Institute, Florence, http://eudo-citizenship.eu/admin/?p=file&appl=countryPro-files&f=Iceland.pdf 

Joppke Ch. (2010), Citizenship and migration, Polity Press, Cambridge

Morawska E. (1994), In Defense of Assimilation Model, “Journal of American Ethnic History” Vol. 13, No. 2

Murray D. (2017), The Strange Death of Europe: Immigration, Identity, Bloomsbury Continuum, London

Napiórkowski M. (2018), Stany Iluzji [The US of Illusion], „Tygodnik Powszechny” No. 16, https://www.tygodnikpowszechny.pl/stany-iluzji-152628

OECD/EU (2015), Civic engagement of immigrants, (in:) Indicators of Immigrant Integration 2015: Settling In, OECD Publishing, Paris, http://dx.doi.org/10.1787/9789264234024-14-en 

Okólski M. (2009), Polska jako aktor na europejskiej scenie migracyjnej [Poland as an actor on the European migration scene], (in:) Współczesne migracje: dylematy Europy i Polski [Contemporary migrations: dilemmas of Europe and Poland], (Eds.) Duszczyk M., Lesińska M., Ośrodek Badań nad Migracjami, Uniwersytet Warszawski, Warszawa

Portes A., Zhou M. (1993), The New Second Generation: Segmented Generation and Its Variants, “The Annals of the American Academy of Political and Social Science” Vol. 530

Preuß U.K. (1993), O teoretyczno-konstytucyjnym pojęciu obywatelstwa we współczesnym społeczeństwie [On the theoretical and constitutional concept of citizenship in contemporary society], (in:) Obywatel: odrodzenie pojęcia [Citizen: the rebirth of the concept], (Ed.) Markiewicz B., IFiS PAN, Warszawa

Raciborski J. (2010), Wprowadzenie: oblicza obywatelstwa [Introduction: citizienship], (in:) Praktyki obywatelskie Polaków [Poles: Citizenship practices], (Ed.) Idem, IFiS PAN, Warszawa

Scheffer P. (2011), Immigrant Nation, Polity Press, Cambridge

Statistics Iceland (2016), Foreign citizens gaining Icelandic citizenship by country of birth, sex and age 1991-2016, http://px.hag-stofa.is/pxen/pxweb/en/Ibuar/Ibuar__mannfjoldi__3_bakgrun-nur__Rikisfbr/MAN04120.px/table/tableViewLayout1/?rxid=148f64bb-3774-46ed-a739-4edcc34b0b5a [09.05.2017]

Statistics Iceland (2017), Population by country of birth, sex and age 1 Janu-ary 1998-2017, http://px.hagstofa.is/pxen/pxweb/en/Ibuar/Ibuar__mannfjoldi__3_bakgrunnur__Faedingarland/MAN12103.px/table/tableViewLayout1/?rxid=148f64bb-3774-46ed-a739-4edc c34b0b5a [09.05.2017]

Trevena P. (2008), Teorie i doktryny dotyczące integracji imigrantów. Doświadczenia tradycyjnych i nowych kręgów kulturowych [Theories and doctrines regarding integration of immigrants. Experiences of traditional and new cultural circles], (in:) Problemy integracji imigrantów. Koncepcje, badania, polityki [Problems of immigrant integration. Concepts, research, policies], (Eds.) Grzymała-Kazłowska A., Łodziński S., Wydawnictwo Uniwersytetu Warszawskiego, Warszawa

Weber M. (2013), Economy and Society, University of California Press, Oakland

Wu S., Schimmele Ch.M., Hou F. (2012), Self-perceived Integration of Immigrants and Their Children, “Canadian Journal of Sociology” Vol. 37, No. 4