Murphy, R., & Smalzer, W. R. (2002). Basic grammar in use: Reference and practice for students of english (Second edition.). Cambridge University Press.

Murphy, Raymond, and William R. Smalzer. Basic Grammar in Use: Reference and Practice for Students of English. Second edition. Cambridge: Cambridge University Press, 2002.

Murphy, Raymond, and William R. Smalzer. Basic Grammar in Use: Reference and Practice for Students of English. Second edition. Cambridge University Press, 2002.