(2006). Age 2: Findings From the 2-Year-Old Follow-up of the Early Childhood Longitudinal Study, Birth Cohort. U.S. Department of Education.
Chicago-čujuhus (17. p.)Age 2: Findings From the 2-Year-Old Follow-up of the Early Childhood Longitudinal Study, Birth Cohort. U.S. Department of Education, 2006.
MLA-čujuhus (9. p.)Age 2: Findings From the 2-Year-Old Follow-up of the Early Childhood Longitudinal Study, Birth Cohort. U.S. Department of Education, 2006.
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