1. Adamczuk, L., Firlit, E., & Zdaniewicz, W. (Eds.). (2013). Postawy społeczno–religijne Polaków 1991–2012. Warszawa: Institute of Statistics of the Catholic Church.
2. AGI. (1994). Sex and America’s teenagers. New York: Alan Guttmacher Institute (AGI).
3. Arnett, J. J. (2000). Emerging adulthood: A theory of development from the late teens through the twenties. American Psychologist, 55(5), 469–480.
4. Bajos, N., Bozon, M., Beltzer, N., Laborde, C., Andro, A., Ferrand, M., Goulet, V., Laporte, A., Le Van, C., Leridon, H., Levinson, S., Razafindratsima, N., Toulemon, L., Warszawski, J., & Wellings, K. (2010). Changes in sexual behaviours: From secular trends to public health policies. AIDS, 24(8), 1185–1191.
5. Bajos, N., Guillaume, A., & Kontula, O. (2003). Reproductive health behaviour of young Europeans. (Population Studies, No. 42, Vol. 1). Strasbourg: Council of Europe Publishing.