To cite letsR in publications use:

Bruno Vilela, Fabricio Villalobos (2015). “letsR: a new R package for data handling and analysis in macroecology.” Methods in Ecology and Evolution. http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12401/abstract.

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},
  }