APA-viite (7. p.)

(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-viite (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-viite (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.