http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
development of children's concepts of causal relations
Reprint of the ed. published by the University of Minnesota Press, Minneapolis, which was issued as no. 13 of Monograph series of the Institute of Child Welfare, University of Minnesota.
Based on the author's thesis, University of Minnesota, 1935.
Institute of Child Development and Welfare.