To cite package 'robCompositions' in publications you might use:

Templ M, Hron K, Filzmoser P (2011). robCompositions: an R-package for robust statistical analysis of compositional data. John Wiley and Sons. ISBN 978-0-470-71135-4, doi:10.1002/9781119976462.ch25.

Filzmoser P, Hron K, Templ M (2018). Applied Compositional Data Analysis. With Worked Examples in R. Springer International Publishing. Springer Nature Switzerland AG, Cham, Switzerland. ISBN 978-3-319-96420-1, doi:10.1007/978-3-319-96422-5, Springer Series in Statistics.

Corresponding BibTeX entries:

  @Book{,
    title = {rob{C}ompositions: an R-package for robust statistical
      analysis of compositional data},
    author = {Matthias Templ and Karel Hron and Peter Filzmoser},
    publisher = {{J}ohn {W}iley and {S}ons},
    isbn = {978-0-470-71135-4},
    booktitle = {{C}ompositional {D}ata {A}nalysis: {T}heory and
      {A}pplications},
    year = {2011},
    pages = {341--355},
    doi = {10.1002/9781119976462.ch25},
  }

  @Book{,
    title = {Applied Compositional Data Analysis. With Worked Examples
      in {R}},
    author = {Peter Filzmoser and Karel Hron and Matthias Templ},
    publisher = {Springer International Publishing. Springer Nature
      Switzerland AG, Cham, Switzerland},
    note = {Springer Series in Statistics},
    isbn = {978-3-319-96420-1},
    doi = {10.1007/978-3-319-96422-5},
    year = {2018},
  }