Cita APA (7th ed.)
Wallis, W. A., & Roberts, H. V. Statistics: A New Approach. Free Press.
Cita Chicago (17th ed.)
Wallis, W. Allen, i Harry V. Roberts. Statistics: A New Approach. Nueva York, EUA: Free Press.
Cita MLA (9th ed.)
Wallis, W. Allen, i Harry V. Roberts. Statistics: A New Approach. Free Press.
Atenció: Aquestes cites poden no estar 100% correctes.