Blass, L. (2007). Quest: Listening and speaking. Boston: McGraw-Hill.
Chicago Style aipamenaBlass, Laurie. Quest: Listening and Speaking. Boston: McGraw-Hill, 2007.
MLA aipamenaBlass, Laurie. Quest: Listening and Speaking. Boston: McGraw-Hill, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.