Richardson John E. (2009). Marketing 08/09. American: McGraw -Hill.
Chicago Style aipamenaRichardson John E. Marketing 08/09. American: McGraw -Hill, 2009.
MLA aipamenaRichardson John E. Marketing 08/09. American: McGraw -Hill, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.