R quote, in what year to quote?

In most cases, my version and R packages are fairly modern. Now I wonder what year to quote when using citation("somepackage") . Basically, all packages are 2012. How can I find out the real date when they first appeared? Or should I give the latest version?

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The norm in the medical field seems to result in something similar in the text:

 We used Stata version 9.2 (Stata Corporation, East Nowhere, Texas, 2006). 

This norm indicates the citation of the year of the version that you actually used. And, in my opinion, it makes sense if you want subsequent authors to be able to copy your results.

There is a whole new field that is trying to understand how to quote things other than papers (see, for example, Heather Pivawar's Work ). If you want to publish the article "Journal of Statistical Software" in version R (most likely for packages than for base R), you can cite this. Or specify R-log updates for the corresponding version.

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Why does no one mention the obvious? In R itself there is a citation() command:

 edd@max :~$ R --silent -e 'citation()' R> citation() To cite R in publications use: R Core Team (2012). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, URL http://www.R-project.org/. A BibTeX entry for LaTeX users is @Manual{, title = {R: A Language and Environment for Statistical Computing}, author = {{R Core Team}}, organization = {R Foundation for Statistical Computing}, address = {Vienna, Austria}, year = {2012}, note = {{ISBN} 3-900051-07-0}, url = {http://www.R-project.org/}, } We have invested a lot of time and effort in creating R, please cite it when using it for data analysis. See also 'citation("pkgname")' for citing R packages. R> R> edd@max :~$ 
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