Seif Aldin، A. H. (1992). Device for Correcting Oral Errors of Secondary School Students in EFL Classes. دراسات تربوية، مج7, ج39 ، 204 - 280. مسترجع من http://search.mandumah.com/Record/657095
Seif Aldin، Ahmed Hassan. "Device for Correcting Oral Errors of Secondary School Students in EFL Classes." دراسات تربوية مج7, ج39 (1992): 204 - 280. مسترجع من http://search.mandumah.com/Record/657095