Robbins, N. B. (2005). Creating more effective graphs. John Wiley.
Chicago Style aipamenaRobbins, Naomi B. Creating More Effective Graphs. London: John Wiley, 2005.
MLA aipamenaRobbins, Naomi B. Creating More Effective Graphs. John Wiley, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.