To cite rsm in publications use:
Lenth R (2009). “Response-Surface Methods in R, Using rsm.” Journal of Statistical Software, 32(7), 1–17. doi:10.18637/jss.v032.i07.
Corresponding BibTeX entry:
@Article{, title = {Response-Surface Methods in {R}, Using {rsm}}, author = {Russell Lenth}, journal = {Journal of Statistical Software}, year = {2009}, volume = {32}, number = {7}, pages = {1--17}, doi = {10.18637/jss.v032.i07}, }