. (2011). . University Textbooks; Research and Writting, 15(24), 7-15.
. "", University Textbooks; Research and Writting, 15, 24, 2011, 7-15.
. (2011). '', University Textbooks; Research and Writting, 15(24), pp. 7-15.
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. . University Textbooks; Research and Writting. 2011;15(24):7-15 (In Persian).
