Ober, S. (2001). Contemporary business communication (3rd ed.). Boston: Houghton Mifflin.
Chicago Style aipamenaOber, Scot. Contemporary Business Communication. 3rd ed. Boston: Houghton Mifflin, 2001.
MLA aipamenaOber, Scot. Contemporary Business Communication. 3rd ed. Boston: Houghton Mifflin, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.