Calvin, R. J. (2000). Sales management. New York, NY: McGraw-Hill.
Chicago Style aipamenaCalvin, Robert J. Sales Management. New York, NY: McGraw-Hill, 2000.
MLA aipamenaCalvin, Robert J. Sales Management. New York, NY: McGraw-Hill, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.