Citazione Stile APA (7a Edizione)

Elderton, W. P., & Johnson, N. L. (1969). Systems of frequency curves. Cambridge University.

Citazione stile Chigago Style (17a edizione)

Elderton, William Palin, e Norman Lloyd Johnson. Systems of Frequency Curves. Cambridge: Cambridge University, 1969.

Citatione MLA (9a ed.)

Elderton, William Palin, e Norman Lloyd Johnson. Systems of Frequency Curves. Cambridge University, 1969.