9Pekrun R,Thomas Gortz,Wolfram Titz.Academic emotions in students'self-regulated learning and achievement:A program of qualitative and quantitative research[J].Educational Psychologist,2002,37(2):91-105.
10Pekrun R, Thomas Gortz, Wolfram Titz, et al.. Academic emotions in students ' self-regulated learning and achievement:A program of qualitative and quantitative research.. Educational Psychologist, 2002,37(2): 91--105.