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Olson, Willard C.,Child Development. Boston: D. C. Heath and Company, 1st edition, 1949. 2nd edition, in preparation.
Olson, Willard C.,Die Entwicklung des Kindes. Bad Homburg: Dr. Max Gehlen, 1953.
Olson, Willard C.,Skolans Ansvar För Barnets Utveckling. Pedagogiska Skrifter. Göteborg: Elanders Boktrycken Aktiebolag, 1954.
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Olson, W.C. Achievement as development. Int Rev Educ 3, 135–142 (1957). https://doi.org/10.1007/BF01417278
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DOI: https://doi.org/10.1007/BF01417278