APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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