APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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