(2006). Age 2: Findings From the 2-Year-Old Follow-up of the Early Childhood Longitudinal Study, Birth Cohort. U.S. Department of Education.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Age 2: Findings From the 2-Year-Old Follow-up of the Early Childhood Longitudinal Study, Birth Cohort. U.S. Department of Education, 2006.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Age 2: Findings From the 2-Year-Old Follow-up of the Early Childhood Longitudinal Study, Birth Cohort. U.S. Department of Education, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.