Langan John. (2007). English Skills with Readings (Tái bản lần thứ 7.). American: Mc Graw-Hill.
শিকাগো স্টাইলে সাইটেশনLangan John. English Skills With Readings. Tái bản lần thứ 7. American: Mc Graw-Hill, 2007.
এমএলএ সাইটেশনLangan John. English Skills With Readings. Tái bản lần thứ 7. American: Mc Graw-Hill, 2007.
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