Clasen, J. “Leistungen an Familien Mit Kindern Im Internationalen Vergleich: An International Comparison of Benefits Paid to Families With Children”. Journal of Family Research, vol. 6, no. 1/2, Sept. 1994, pp. p. 95-101, https://ubp.uni-bamberg.de/jfr/index.php/jfr/article/view/595.