Cita APA (7a ed.)

Wallis, W. A., & Roberts, H. V. (1956). Statistics a new approach. The Free.

Cita Chicago Style (17a ed.)

Wallis, W. Allen, y Harry V. Roberts. Statistics a New Approach. Nueva York: The Free, 1956.

Cita MLA (9a ed.)

Wallis, W. Allen, y Harry V. Roberts. Statistics a New Approach. The Free, 1956.