To cite robustbase in publications use:

Peter Rousseeuw, Christophe Croux, Valentin Todorov, Andreas Ruckstuhl, Matias Salibian-Barrera, Tobias Verbeke, Manuel Koller, Martin Maechler (2014). robustbase: Basic Robust Statistics. R package version 0.91-1. URL http://CRAN.R-project.org/package=robustbase

To cite the multivariate class/methods framework use:

Valentin Todorov, Peter Filzmoser (2009). An Object-Oriented Framework for Robust Multivariate Analysis. Journal of Statistical Software, 32(3), 1-47. URL http://www.jstatsoft.org/v32/i03/.

Corresponding BibTeX entries:

  @Manual{,
    title = {{robustbase}: Basic Robust Statistics},
    author = {Peter Rousseeuw and Christophe Croux and Valentin Todorov
      and Andreas Ruckstuhl and Matias Salibian-Barrera and Tobias
      Verbeke and Manuel Koller and Martin Maechler},
    year = {2014},
    note = {R package version 0.91-1},
    url = {http://CRAN.R-project.org/package=robustbase},
  }
  @Article{,
    title = {An Object-Oriented Framework for Robust Multivariate
      Analysis},
    author = {Valentin Todorov and Peter Filzmoser},
    journal = {Journal of Statistical Software},
    year = {2009},
    volume = {32},
    number = {3},
    pages = {1--47},
    url = {http://www.jstatsoft.org/v32/i03/},
  }