Torp, L., & Sage, S. (1998). Problems as possibilities: Problem-based learning for K-12 education. Assoc. for Supervision and Curriculum Development.
Chicago-Zitierstil (17. Ausg.)Torp, Linda, und Sara Sage. Problems as Possibilities: Problem-based Learning for K-12 Education. Alexandria, Va: Assoc. for Supervision and Curriculum Development, 1998.
MLA-Zitierstil (9. Ausg.)Torp, Linda, und Sara Sage. Problems as Possibilities: Problem-based Learning for K-12 Education. Assoc. for Supervision and Curriculum Development, 1998.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.