Richardson, L. I. (1980). A mathematics activity curriculum for early childhood and special education. Macmillan.
Citace podle Chicago (17th ed.)Richardson, Lloyd I. A Mathematics Activity Curriculum for Early Childhood and Special Education. New York: Macmillan, 1980.
Citace podle MLA (9th ed.)Richardson, Lloyd I. A Mathematics Activity Curriculum for Early Childhood and Special Education. Macmillan, 1980.
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