To cite klaR in publications use:

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

Corresponding BibTeX entry:

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