Nafstad, H. E., & Gaardner, S. (1977). Co-operation between parents, pre-school and the community: Local communities and the social and educational value of pre-school. Committee for General and Technical Education.

Nafstad, Hilde Eileen, and Stein Gaardner. Co-operation Between Parents, Pre-school and the Community: Local Communities and the Social and Educational Value of Pre-school. Strasbourg: Committee for General and Technical Education, 1977.

Nafstad, Hilde Eileen, and Stein Gaardner. Co-operation Between Parents, Pre-school and the Community: Local Communities and the Social and Educational Value of Pre-school. Committee for General and Technical Education, 1977.