To cite homals in publications use:

Jan de Leeuw, Patrick Mair (2009). Gifi Methods for Optimal Scaling in R: The Package homals. Journal of Statistical Software, 31(4), 1-20. URL http://www.jstatsoft.org/v31/i04/.

Corresponding BibTeX entry:

  @Article{,
    title = {Gifi Methods for Optimal Scaling in {R}: The Package
      {homals}},
    author = {Jan {de Leeuw} and Patrick Mair},
    journal = {Journal of Statistical Software},
    year = {2009},
    volume = {31},
    number = {4},
    pages = {1--20},
    url = {http://www.jstatsoft.org/v31/i04/},
  }