To cite package 'texmex' in publications use:

Harry Southworth, Janet E. Heffernan and Paul D. Metcalfe (2018). texmex: Statistical modelling of extreme values. R package version 2.4.2.

Corresponding BibTeX entry:

  @Manual{,
    title = {texmex: Statistical modelling of extreme values},
    author = {Harry Southworth and Janet E. Heffernan and Paul D.
      Metcalfe},
    year = {2018},
    note = {R package version 2.4.2},
  }