To cite the 'BIFIEsurvey' package in publications use:

BIFIE (2015). BIFIEsurvey: Tools for survey statistics in educational assessment. R package version 1.7-0.

Corresponding BibTeX entry:

  @Manual{,
    title = {BIFIEsurvey: Tools for survey statistics in educational
      assessment},
    author = {{BIFIE}},
    year = {2015},
    note = {R package version 1.7-0},
  }