Cita APA (7a ed.)

Wallis, W. A., & Roberts, H. V. (1956). Statistics: A new approach (3rd printing.). Free Press.

Cita Chicago Style (17a ed.)

Wallis, W. Allen, y Harry V. Roberts. Statistics: A New Approach. 3rd printing. Glencoe: Free Press, 1956.

Cita MLA (9a ed.)

Wallis, W. Allen, y Harry V. Roberts. Statistics: A New Approach. 3rd printing. Free Press, 1956.