May, P. (1999). Knockout first certificate: Student's book (5th ed.). Oxford: Oxford University Press.
استشهاد بنمط شيكاغوMay, Peter. Knockout First Certificate: Student's Book. 5th ed. Oxford: Oxford University Press, 1999.
MLA استشهادMay, Peter. Knockout First Certificate: Student's Book. 5th ed. Oxford: Oxford University Press, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.