(1993). Cambridge proficiency examination practice 5 (Teacher's book). Cambridge, UK: Cambridge Univ. Press.
Chicago Style aipamenaCambridge Proficiency Examination Practice 5 (Teacher's Book). Cambridge, UK: Cambridge Univ. Press, 1993.
MLA aipamenaCambridge Proficiency Examination Practice 5 (Teacher's Book). Cambridge, UK: Cambridge Univ. Press, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.