To cite plfm in publications use:

Michel Meulders (2013). An R Package for Probabilistic Latent Feature Analysis of Two-Way Two-Mode Frequencies. Journal of Statistical Software, 54(14), 1-29. URL http://www.jstatsoft.org/v54/i14/.

Corresponding BibTeX entry:

  @Article{,
    title = {An {R} Package for Probabilistic Latent Feature Analysis
      of Two-Way Two-Mode Frequencies},
    author = {Michel Meulders},
    journal = {Journal of Statistical Software},
    year = {2013},
    volume = {54},
    number = {14},
    pages = {1--29},
    url = {http://www.jstatsoft.org/v54/i14/},
  }