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Children's concepts of ability, effort, and conduct:

Blumenfeld, Phyllis C ; Pintrich, Paul R ; Hamilton, V. Lee
American educational research journal.  23 (1986)  1 - p. 95-104 , 1986
Link: https://doi.org/10.3102/00028312023001095
Exemplar:  Zentrale:E03 z pae 001 jc/277; Zentrale:Magazin Zs fc 5277