To cite robustrao in publications use:

  Calatrava Moreno, M.C. and Thomas A. (2016). robustrao: An R package
  to calculate the Rao-Stirling diversity index and its extension to
  acknowledge missing data.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {robustrao: An Extended Rao-Stirling Diversity Index to Handle Missing Data},
    author = {María del Carmen Calatrava Moreno and Thomas Auzinger},
    year = {2016},
  }