Adrian Doff, & Adrian Doff; Ben Goldstein. (2011). English unlimited. C1, Advanced Coursebook with e-Portfolio. Cambridge: Cambridge University Press.
استشهاد بنمط شيكاغوAdrian Doff, و Adrian Doff; Ben Goldstein. English Unlimited. C1, Advanced Coursebook With E-Portfolio. Cambridge: Cambridge University Press, 2011.
MLA استشهادAdrian Doff, و Adrian Doff; Ben Goldstein. English Unlimited. C1, Advanced Coursebook With E-Portfolio. Cambridge: Cambridge University Press, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.