Vogt, F., C. Löffler, A. Haid, N. Itel, M. Schönfelder, B. Zumwald, and E. Reichmann. “Fostering Language Development in the Everyday Practices of Kindergarten, Nursery and Playgroups: A Video Study”. Swiss Journal of Educational Research, Vol. 37, no. 1, Mar. 2015, pp. 93-112, doi:10.24452/sjer.37.1.4945.