1. Andeaæs, A., & Haavind, H. (1987).Småbarns livsvilkår i Norge (The living conditions of Norwegain children). Oslo: Universitetsforlaget.
2. Bergström T., & Blomquist, S. (1993). “The political economy of subsidized day care and labor supply”.Unpublished manuscript. University of Uppsala, Sweden.
3. Booth, A. (Ed.) (1992).Child care in the 1990’s. Trends and consequences. London: Lawrence Erlbaum Associates.
4. Borge, A.I.H. (1995).Kvalitet i barnehagen (Quality in day care centers). Oslo: Statens Institutt for folkehelse.
5. Borge, A.I.H., Hartmann E., & Strøm, S. (Eds.) (1994).Day care centers: Quality and provision. Oslo: National Institute of Public Health.