Zitat
L. Ahnert, L. Teufl, N. Ruiz, B. Piskernik, B. Supper, S. Remiorz, A. Gesing, and K. Nowacki, “Father-child play during the preschool years and child internalizing behaviors,” Infant mental health journal, vol. 38 (2017), no. 6, pp. 743–756, 2017.