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