Dumont, R. A. (1987). Business communications workbook. Little, Brown.
Chicago Style (17th ed.) ZitazioaDumont, Raymond A. Business Communications Workbook. Boston: Little, Brown, 1987.
MLA (9th ed.) ZitazioaDumont, Raymond A. Business Communications Workbook. Little, Brown, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.