To cite package 'QCA3' in publications use:

HUANG, Ronggui. (2011). QCA3: Yet another package for Qualitative Comparative Analysis.R package version 0.0-5. URL http://asrr.r-forge.r-project.org/.

Corresponding BibTeX entry:

  @Manual{,
    title = {QCA3: Yet another package for Qualitative Comparative
      Analysis},
    author = {Ronggui HUANG},
    year = {2011},
    note = {R package version 0.0-5},
    url = {http://asrr.r-forge.r-project.org/},
  }