Cita APA (7th ed.)
Murphy, R. (1997). Essential grammar in use (2a. ed.). At the University Press.
Cita Chicago (17th ed.)
Murphy, Raymond. Essential Grammar in Use. 2a. ed. Cambridge: At the University Press, 1997.
Cita MLA (9th ed.)
Murphy, Raymond. Essential Grammar in Use. 2a. ed. At the University Press, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.