Murphy, R. (1992). Essential Englsih Grammar (2 nd.). Cambrdge University Press.
Chicago Style aipamenaMurphy, Raymond. Essential Englsih Grammar. 2 nd. New Delhi: Cambrdge University Press, 1992.
MLA aipamenaMurphy, Raymond. Essential Englsih Grammar. 2 nd. Cambrdge University Press, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.