APA (7th ed.) Citation

Wickham, H. (2009). ggplot2: Elegant graphics for data analysis. Springer.

Chicago Style (17th ed.) Citation

Wickham, Hadley. Ggplot2: Elegant Graphics for Data Analysis. Dordrecht [u.a.]: Springer, 2009.

MLA (9th ed.) Citation

Wickham, Hadley. Ggplot2: Elegant Graphics for Data Analysis. Springer, 2009.