Steven, J. (2000). E-mail Marketing. John Wiley & Sons.
Chicago Style aipamenaSteven, Jim. E-mail Marketing. New York: John Wiley & Sons, 2000.
MLA aipamenaSteven, Jim. E-mail Marketing. John Wiley & Sons, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.