To cite envoutliers in publications use:

  Campulova Martina, Campula Roman (2019). An R Package for
  Identification of Outliers in Environmental Data.

A BibTeX entry for LaTeX users is

  @Unpublished{,
    title = {An R Package for Identification of Outliers in Environmental Data},
    author = {Campulova Martina and Campula Roman},
    year = {2019},
    note = {To be published},
  }