Oberndorfer, R., and H. Rost. “Neue Väter - Anspruch Und Realität: New Fathers - Claim and Reality”. Journal of Family Research, vol. 17, no. 1, Apr. 2005, pp. p. 50-65, https://ubp.uni-bamberg.de/jfr/index.php/jfr/article/view/384.