National Research Council (U.S.). Committee on Early Childhood Mathematics, ebrary, Inc, Cross, C. T., Woods, T. A., & Schweingruber, H. A. (2009). Mathematics learning in early childhood: Paths toward excellence and equity. National Academies Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Committee on Early Childhood Mathematics, Inc ebrary, Christopher T. Cross, Taniesha A. Woods, و Heidi A. Schweingruber. Mathematics Learning in Early Childhood: Paths Toward Excellence and Equity. Washington, DC: National Academies Press, 2009.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Research Council (U.S.). Committee on Early Childhood Mathematics, et al. Mathematics Learning in Early Childhood: Paths Toward Excellence and Equity. National Academies Press, 2009.