APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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