To cite relaimpo in publications use:
Ulrike Grömping (2006). Relative Importance for Linear Regression in R: The Package relaimpo. Journal of Statistical Software, 17(1), 1--27.
Your version of package relaimpo: R package version 2.2-3
Corresponding BibTeX entry:
@Article{, title = {Relative Importance for Linear Regression in R: The Package relaimpo}, author = {Ulrike Grömping}, journal = {Journal of Statistical Software}, year = {2006}, volume = {17}, number = {1}, pages = {1--27}, }