Swan, M., & Walter, C. (1997). How English works: A grammar practice book. Oxford, England: Oxford University Press.
استشهاد بنمط شيكاغوSwan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book. Oxford, England: Oxford University Press, 1997.
MLA استشهادSwan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book. Oxford, England: Oxford University Press, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.