1. Allison, P. D. (1994). Using panel data to estimate the effects of events. Sociological Methods and Research, 23, 174–199.
2. Allison, P. D. (2009). Fixed effects regression models. Thousand Oaks, CA: SAGE Publications.
3. Bauer, J. M., & Sousa-Poza, A. (2015). Impacts of informal caregiving on caregiver employment, health, and family. Journal of Population Ageing, 8(3), 113–145.
4. Bertogg, A., & Strauss, S. (2018). Spousal care-giving arrangements in Europe: The role of gender, socio-economic status and the welfare state. Ageing and Society, 1–24.
5. Bestmann, B., Wüstholz, E., & Verheyen, F. (2014). Pflegen: Belastung und sozialer Zusammenhalt; eine Befragung zur Situation von pflegenden Angehörigen (WINEG Wissen, Vol. 4). Hamburg: Techniker Krankenkasse.