Harriet J. Vermeer

Motivational and Gender Differences: Sixth-Grade Students' Mathematical Problem-Solving Behavior.

Gerard Seegers, M. Boekaerts, Monique Boekaerts, 2000 .

Children's wellbeing and cortisol levels in home-based and center-based childcare.

Mariëlle Linting, Marinus H. van IJzendoorn, Harriet J. Vermeer, 2010 .