Não informado. (1969). International Journal of Early Childhood. World Organization for Early Childwood Education.
Chicago-Zitierstil (17. Ausg.)Não informado. International Journal of Early Childhood. Dublin: World Organization for Early Childwood Education, 1969.
MLA-Zitierstil (8. Ausg.)Não informado. International Journal of Early Childhood. World Organization for Early Childwood Education, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.