Etzel, M. J. (2004). Marketing. Boston, Mass: McGraw-Hill.
Chicago Style aipamenaEtzel, Michael J. Marketing. Boston, Mass: McGraw-Hill, 2004.
MLA aipamenaEtzel, Michael J. Marketing. Boston, Mass: McGraw-Hill, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.