Cita APA (7a ed.)

Ryan, T. P. (1989). Statistical methods for quality improvement. Wiley & Sons.

Cita Chicago Style (17a ed.)

Ryan, Thomas P. Statistical Methods for Quality Improvement. New York [etc.]: Wiley & Sons, 1989.

Cita MLA (9a ed.)

Ryan, Thomas P. Statistical Methods for Quality Improvement. Wiley & Sons, 1989.