TY  - GEN
AU  - Bercken, John
TI  - Task motivation at the beginning and the end of a school-year
KW  - Psicologia e Educacao
KW  - 3500 - Psicologia Educacional
UR  - https://catalogo.ispa.pt/opac/biblioteca/localizacao_doc/r4.htm
ER  -