Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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