APA aipamena

Barbara Robinson. (1998). Focus: Interactive grammar for students of ESL. Cambridge, UK: Cambridge Univ. Press.

Chicago Style aipamena

Barbara Robinson. Focus: Interactive Grammar for Students of ESL. Cambridge, UK: Cambridge Univ. Press, 1998.

MLA aipamena

Barbara Robinson. Focus: Interactive Grammar for Students of ESL. Cambridge, UK: Cambridge Univ. Press, 1998.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.