Cita APA (7th ed.)
Chang, W. R Graphics Cookbook. O'Reilly.
Cita Chicago (17th ed.)
Chang, Winston. R Graphics Cookbook. Sebastopol, EUA: O'Reilly.
Cita MLA (9th ed.)
Chang, Winston. R Graphics Cookbook. O'Reilly.
Atenció: Aquestes cites poden no estar 100% correctes.