National Education Association of the United States. Department of Elementary-Kindergarten-Nursery Education. (1968). Kindergarten education. s. n.
Chicago-Zitierstil (17. Ausg.)National Education Association of the United States. Department of Elementary-Kindergarten-Nursery Education. Kindergarten Education. [Washington, D. C: s. n, 1968.
MLA-Zitierstil (9. Ausg.)National Education Association of the United States. Department of Elementary-Kindergarten-Nursery Education. Kindergarten Education. s. n, 1968.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.