Gheytanchi,S , , Borzabadei Farahani,D , and Babaei,H . "The Effect of Introversion/ Extroversion of Iranian Students of Japanese on Their Speaking Ability in Terms of Accuracy, Fluency and Lexical Density", Journal of Foreign Language Research, 2, 2, 2012, 99-113. doi: 10.22059/jflr.2012.50920