Harding, K., & Wallwork, A. (2007). International express: Upper-intermediate .Student's Book. Oxford: Oxford Univ. Press.
استشهاد بنمط شيكاغوHarding, Keith, و Adrian Wallwork. International Express: Upper-intermediate .Student's Book. Oxford: Oxford Univ. Press, 2007.
MLA استشهادHarding, Keith, و Adrian Wallwork. International Express: Upper-intermediate .Student's Book. Oxford: Oxford Univ. Press, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.