Ur, P. (1981). Discussion that work: Task-centred fluency practice. Cambridge: Cambridge University.
استشهاد بنمط شيكاغوUr, Penny. Discussion That Work: Task-centred Fluency Practice. Cambridge: Cambridge University, 1981.
MLA استشهادUr, Penny. Discussion That Work: Task-centred Fluency Practice. Cambridge: Cambridge University, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.