To cite the kohonen package publications use:
R. Wehrens and L.M.C. Buydens, Self- and Super-organising Maps in R: the kohonen package J. Stat. Softw., 21(5), 2007
Corresponding BibTeX entry:
@Article{, title = {Self- and Super-organising Maps in R: the kohonen package}, author = {R. Wehrens and L.M.C. Buydens}, year = {2007}, journal = {J. Stat. Softw.}, volume = {21}, number = {5}, url = {http://www.jstatsoft.org/v21/i05}, }