Mary Stephens. (2002). New proficiency reading. New Jersey: Pearson.
Chicago Style aipamenaMary Stephens. New Proficiency Reading. New Jersey: Pearson, 2002.
MLA aipamenaMary Stephens. New Proficiency Reading. New Jersey: Pearson, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.