National Education Association of the United States. Research Division. (1962). Kindergarten practices, 1961. Research Division, National Education Association.
Chicago-viite (17. p.)National Education Association of the United States. Research Division. Kindergarten Practices, 1961. Washington, D.C.: Research Division, National Education Association, 1962.
MLA-viite (8. p.)National Education Association of the United States. Research Division. Kindergarten Practices, 1961. Research Division, National Education Association, 1962.
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