About Welfare states...

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Arts, Wil and Gelissen John; "Three Worlds of Welfare Capitalism or More? A State-of-the-art report" Journal of European Social Policy:2: 2 (2002):137–58.
Bartholomew, James (2015). The Welfare of Nations. Biteback. p. 448. ISBN 978-1849548304.
Francis G. Castles; et al. (2010). The Oxford Handbook of the Welfare State. Oxford Handbooks Online. p. 67.
Esping-Andersen, Gosta; Politics against markets, Princeton, NJ: Princeton University Press (1985).
Esping-Andersen, Gosta; "The Three Worlds of Welfare Capitalism", Princeton NJ: Princeton University Press (1990).
Ferragina, E. et al. (2015) The Four Worlds of ‘Welfare Reality’ – Social Risks and Outcomes in Europe. Social Policy and Society, 14 (2), 287–307.
Ferragina, Emanuele and Martin Seeleib-Kaiser, "Welfare Regime Debate: Past, Present, Futures?" Policy & Politics: 39 (2011): 4: 583–611.
Kenworthy, Lane. Social Democratic America. Oxford University Press (2014). ISBN 0199322511
Korpi, Walter; "The Democratic Class Struggle"; London: Routledge (1983).
Koehler, Gabriele and Deepta Chopra; "Development and Welfare Policy in South Asia"; London: Routledge (2014).
Kuhnle, Stein. "The Scandinavian Welfare State in the 1990s: Challenged but Viable." West European Politics (2000) 23#2 pp. 209–28
Kuhnle, Stein. Survival of the European Welfare State 2000 Routledge ISBN 0-415-21291-X
Rothstein, Bo. Just institutions matter: the moral and political logic of the universal welfare state (Cambridge University Press, 1998)
Radcliff, Benjamin (2013) The Political Economy of Human Happiness (New York: Cambridge University Press).
Rachel Reeves, Rachel, and Martin McIvor. "Clement Attlee and the foundations of the British welfare state." Renewal: a Journal of Labour Politics 22#3/4 (2014): 42+. online
Tanner, Michael (2008). "Welfare State". In Hamowy, Ronald. The Encyclopedia of Libertarianism. Thousand Oaks, CA: SAGE; Cato Institute. pp. 540–42. doi:10.4135/9781412965811.n327. ISBN 978-1-4129-6580-4. LCCN 2008009151. OCLC 750831024.
Van Kersbergen, K. "Social Capitalism"; London: Routledge (1995).
Vrooman, J.C. "Regimes and Cultures of Social Security: Comparing Institutional Models through Nonlinear PCA"; International Journal of Comparative Sociology:, 53: 5–6 (2012): 444–77.

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in: https://en.wikipedia.org/wiki/Welfare_state