. (2009). . University Textbooks; Research and Writting, 14(21), 50-64.
. "", University Textbooks; Research and Writting, 14, 21, 2009, 50-64.
. (2009). '', University Textbooks; Research and Writting, 14(21), pp. 50-64.
, "," University Textbooks; Research and Writting, 14 21 (2009): 50-64,
. . University Textbooks; Research and Writting. 2009;14(21):50-64 (In Persian).
