Kaynaklar
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Bety Schrampfer Azar, Understanding and Using English Grammer, Prentice Hall, 1993.
Bety Schrampfer Azar, Understanding and Using English Gramer Workbook, Prentice Hall, 1993.
Kandiller B. - Velioğlu A., Reader at Work, ODTÜ Yayınları, Ankara, 1999.
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