1. Adsera, A. (2004). Marital fertility and religion: Recent changes in Spain. Discussion paper, no. 1399, IZA (Institute for the Study of Labor), Bonn.
2. Bélanger, A., & Ouellet, G. (2002). A comparative study of recent trends in Canadian and American fertility, 1980–1999. In A. Bélanger (Ed.), Report on the demographic situation in Canada (pp. 107–136), 2001. Statistics Canada, Cat. No. 91-209-XPE. Ottawa.
3. Berger, P. (2005). Statement at roundtable “Secular Europe and religious America: Implications for transatlantic relations”. The Pew Forum on Religion & Public Life, April 21, pp. 1–4.
4. Billings, J. S. (1889). Vital statistics of the Jews in the United States. Census Bulletin, 19, 4–9.
5. Caldwell, J., & Schindlmayr, T. (2003). Explanations of the fertility crisis in modern societies: A search for commonalities. Population Studies, 57(3), 241–263.