To cite klaR in publications use:

Weihs, C., Ligges, U., Luebke, K. and Raabe, N. (2005). klaR Analyzing German Business Cycles. In Baier, D., Decker, R. and Schmidt-Thieme, L. (eds.). Data Analysis and Decision Support, 335-343, Springer-Verlag, Berlin.

Corresponding BibTeX entry:

  @inproceedings{,
    title = {klaR Analyzing German Business Cycles},
    author = {Claus Weihs and Uwe Ligges and Karsten Luebke and Nils
      Raabe},
    booktitle = {Data Analysis and Decision Support},
    editor = {D. Baier},
    editor = {R. Decker},
    editor = {L. Schmidt-Thieme},
    publisher = {Springer-Verlag},
    address = {Berlin},
    year = {2005},
    pages = {335-343},
  }