Alex Tilbury. (2011). English unlimited. B1, Pre-intermediate Coursebook with e-Portfolio. Cambridge: Cambridge University Press.
استشهاد بنمط شيكاغوAlex Tilbury. English Unlimited. B1, Pre-intermediate Coursebook With E-Portfolio. Cambridge: Cambridge University Press, 2011.
MLA استشهادAlex Tilbury. English Unlimited. B1, Pre-intermediate Coursebook With E-Portfolio. Cambridge: Cambridge University Press, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.