APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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