@article{article.374024,
      title   = {Collaborative Output Tasks and their Effects on Learning English Comparative Adjectives},
      author  = {محمود دهقان,مونا محمدی امیری},
      journal = {Teaching English as a Second Language},
      year    = {2017},
      number  = {1},
      pages  = {},
      url  = {http://ensani.ir/fa/article/374024}
}