To cite package archetypes in publications use:

Manuel J. A. Eugster and Friedrich Leisch. From Spider-Man to Hero -- Archetypal Analysis in R. Journal of Statistical Software, 30(8), 1-23, 2009. http://www.jstatsoft.org/v30/i08/

Corresponding BibTeX entry:

  @Article{,
    title = {{From {S}pider-{M}an to {H}ero -- Archetypal Analsis in
      {R}},
    author = {Manuel J. A. Eugster and Friedrich Leisch},
    journal = {Journal of Statistical Software},
    year = {2009},
    volume = {30},
    number = {8},
    pages = {1--23},
    url = {http://www.jstatsoft.org/v30/i08/},
  }