Swan, M., & Walter, C. (2009). How English works: A Grammar practice book: With answers. Oxford, England: Oxford University Press.
Chicago-стиль цитированияSwan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book: With Answers. Oxford, England: Oxford University Press, 2009.
MLA-цитированиеSwan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book: With Answers. Oxford, England: Oxford University Press, 2009.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.