Hartup, W. W. (1967). The young child. Reviews of research. National Association for the Education of Young Children.
Chicago-Zitierstil (17. Ausg.)Hartup, Willard W. The Young Child. Reviews of Research. Washington: National Association for the Education of Young Children, 1967.
MLA-Zitierstil (9. Ausg.)Hartup, Willard W. The Young Child. Reviews of Research. National Association for the Education of Young Children, 1967.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.