. (2009). . University Textbooks; Research and Writting, 14(21), 31-49.
. "", University Textbooks; Research and Writting, 14, 21, 2009, 31-49.
. (2009). '', University Textbooks; Research and Writting, 14(21), pp. 31-49.
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. . University Textbooks; Research and Writting. 2009;14(21):31-49 (In Persian).
