Cita APA (7th ed.)
Wickham. ggplot2: Elegant Graphics for Data Analysis 2/e. Springer.
Cita Chicago (17th ed.)
Wickham. Ggplot2: Elegant Graphics for Data Analysis 2/e. Springer.
Cita MLA (9th ed.)
Wickham. Ggplot2: Elegant Graphics for Data Analysis 2/e. Springer.
Atenció: Aquestes cites poden no estar 100% correctes.