Thomas, A. (1970). A practical English grammer (2nd.). O U P.
Chicago Style aipamenaThomas, A. A Practical English Grammer. 2nd. London: O U P, 1970.
MLA aipamenaThomas, A. A Practical English Grammer. 2nd. O U P, 1970.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.