To cite scatterplot3d in publications use:

Ligges, U. and M├Ąchler, M. (2003). Scatterplot3d - an R Package for Visualizing Multivariate Data. Journal of Statistical Software 8(11), 1-20.

Corresponding BibTeX entry:

  @Article{,
    title = {Scatterplot3d - an R Package for Visualizing Multivariate
      Data},
    author = {Uwe Ligges and Martin M{\"a}chler},
    journal = {Journal of Statistical Software},
    year = {2003},
    pages = {1--20},
    number = {11},
    volume = {8},
    url = {http://www.jstatsoft.org},
  }