4Jose-Reyes Ruiz-Gallardo, Santiago Castafio, Juan J.Gomez- Alday, et at. Assessing student workload in Problem Based Learning: Relationships among teaching method, student workload and achievement. A case study in Natural Sciences[J]. Teaching and Teacher Education, 2011,27 (3) : 619-627.
5Nur Izzati Abdullah, Rohani Ahmad Tarmizi, Rosini Abu, et al.The Effects of Problem Based Learning on Mathematics Performance and Affective Attributes in Learning Statistics at Form Four Secondary Level[J].Procedia-Social and Behavioral Sciences, 2010, 27(8) : 370-376.
