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Chicago-viite (17. p.)National Research Council (U.S.). Committee on Early Childhood Mathematics, Inc ebrary, Christopher T. Cross, Taniesha A. Woods, ja Heidi A. Schweingruber. Mathematics Learning in Early Childhood: Paths Toward Excellence and Equity. Washington, DC: National Academies Press, 2009.
MLA-viite (9. p.)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.