Pichinart Kumpawan และ Sumalee Chinokul. (2014) EFFECTS OF FISHER AND FREY'S GRADUAL RELEASE OF RESPONSIBILITY MODEL ON WRITING ABILITY OF TENTH GRADE STUDENTS. Chulalongkorn University:ม.ป.ท.Pichinart Kumpawan และ Sumalee Chinokul. 2014. EFFECTS OF FISHER AND FREY'S GRADUAL RELEASE OF RESPONSIBILITY MODEL ON WRITING ABILITY OF TENTH GRADE STUDENTS. ม.ป.ท.:Chulalongkorn University;Pichinart Kumpawan และ Sumalee Chinokul. EFFECTS OF FISHER AND FREY'S GRADUAL RELEASE OF RESPONSIBILITY MODEL ON WRITING ABILITY OF TENTH GRADE STUDENTS. ม.ป.ท.:Chulalongkorn University, 2014. Print.