To cite letsR in publications use:

Bruno Vilela and Fabricio Villalobos (2015). letsR: a new R package for data handling and analysis in macroecology. Methods in Ecology and Evolution.<doi:10.1111/2041-210X.12401>.

Corresponding BibTeX entry:

  @Article{,
    title = {letsR: a new R package for data handling and analysis in
      macroecology},
    journal = {Methods in Ecology and Evolution},
    author = {{Bruno Vilela} and {Fabricio Villalobos}},
    year = {2015},
    url =
      {http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12401/abstract},
  }