Barbara Robinson. (1998). Focus: Interactive grammar for students of ESL. Cambridge, UK: Cambridge Univ. Press.
Chicago Style CitationBarbara Robinson. Focus: Interactive Grammar for Students of ESL. Cambridge, UK: Cambridge Univ. Press, 1998.
Cita MLABarbara Robinson. Focus: Interactive Grammar for Students of ESL. Cambridge, UK: Cambridge Univ. Press, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.