Thea Faye G. Guia Ma. Mercedes T. Rodrigo Michelle Marie C. Dagami Jessica O. Sugay Francis Jan P. Macam Antonija Mitrovic Modeling the Affective States of Students Using SQL-Tutor. 634-635 2012 ITS http://dx.doi.org/10.1007/978-3-642-30950-2_97 conf/its/2012 db/conf/its/its2012.html#GuiaRDSMM12