Zipf's law holds for phrases, not words.

MLA

Ryland Williams, Jake, et al. “Zipf’s Law Holds for Phrases, Not Words.” Scientific Reports, vol. 5, Aug. 2015, p. 12209. EBSCOhost, https://doi.org/10.1038/srep12209.

APA

Ryland Williams, J., Lessard, P. R., Desu, S., Clark, E. M., Bagrow, J. P., Danforth, C. M., & Sheridan Dodds, P. (2015). Zipf’s law holds for phrases, not words. Scientific Reports, 5, 12209. https://doi.org/10.1038/srep12209

Chicago

Ryland Williams, Jake, Paul R Lessard, Suma Desu, Eric M Clark, James P Bagrow, Christopher M Danforth, and Peter Sheridan Dodds. 2015. “Zipf’s Law Holds for Phrases, Not Words.” Scientific Reports 5 (August): 12209. doi:10.1038/srep12209.