Citing earth

The following BibTex entry seems to do the trick. The extra curly braces in the author field are necessary to get BibTex to order the entry correctly on the last name of the first author.
@book{earthpackage,
  title  = {earth: Multivariate Adaptive Regression Spline Models},
  author = {S. {Milborrow. Derived from mda:mars by T. Hastie and R. Tibshirani.}},
  publisher={R Software Package},
  year   = {2011},
  note   = {\url{http://www.milbo.users.sonic.net/earth}}
}
From within R you can use (you will have to massage the results to get BibTex to order the entry correctly):
> library(earth)
> citation("earth")


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