Introducing Citation Files

To cite ggplot2 in publications, please use:

H. Wickham. ggplot2: elegant graphics for data analysis. Springer New York, 2009.

A BibTeX entry for LaTeX users is

@Book{,
    author = {Hadley Wickham},
    title = {ggplot2: elegant graphics for data analysis},
    publisher = {Springer New York},
    year = {2009},
    isbn = {978-0-387-98140-6},
    url = {http://had.co.nz/ggplot2/book},
}

This is similar in mechanism and intent to the README, LICENSE, and INSTALL files commonly found in open source projects, and while it's not a perfect solution, it's a pretty good one. So go ahead, write some CITATION files today and tweet your project's URL with the hash tag #citationfile; we'll post some of those links here soon.