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citHeader("To cite ggplot2 in publications, please use:") citEntry(entry = "book", author = "Hadley Wickham", title = "ggplot2: Elegant Graphics for Data Analysis", publisher = "Springer-Verlag New York", year = "2016", isbn = "978-3-319-24277-4", url = "https://ggplot2.tidyverse.org", textVersion = "H. Wickham. ggplot2: Elegant Graphics for Data Analysis. Springer-Verlag New York, 2016." )