ABDUL RASYID GHAZALI (2015) PBI UMY STUDENTS’ CRITICAL READING LEVELS. S1 thesis, Universitas Muhammadiyah Yogyakarta.
ABDUL RASYID GHAZALI (2006) PBI UMY STUDENT CRITICALREADING LEVELS. S1 thesis, Universitas Muhammadiyah Yogyakarta.