APA (7th ed.) Citation

Wickham, H. (2016). Writing code for R packages. O'Reilly Media, Inc..

Chicago Style (17th ed.) Citation

Wickham, Hadley. Writing Code for R Packages. [Place of publication not identified]: O'Reilly Media, Inc., 2016.

MLA (9th ed.) Citation

Wickham, Hadley. Writing Code for R Packages. O'Reilly Media, Inc., 2016.