Marshall, D. R. (1999). The four elements of successful management. AMACOM.
Chicago Style aipamenaMarshall, Don R. The Four Elements of Successful Management. New York: AMACOM, 1999.
MLA aipamenaMarshall, Don R. The Four Elements of Successful Management. AMACOM, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.