Ryan, T. P. (2009). Modern regression methods (2a. ed.). John Wiley and Sons.
Cita Chicago (17th ed.)Ryan, Thomas P. Modern Regression Methods. 2a. ed. Hoboken: John Wiley and Sons, 2009.
Cita MLA (9th ed.)Ryan, Thomas P. Modern Regression Methods. 2a. ed. John Wiley and Sons, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.