To cite modi in publications use:

Beat Hulliger (2018). modi: Multivariate outlier detection and imputation for incomplete survey data. R package version 1.6.1 URL ???

Corresponding BibTeX entry:

  @Manual{,
    title = {modi: Multivariate outlier detection and imputation for
      incomplete survey data},
    author = {Beat Hulliger},
    year = {2018},
    note = {R package version 1.6.1},
    url = {???},
  }