To cite fuzzySim in publications use:

Barbosa AM (2015). “fuzzySim: applying fuzzy logic to binary similarity indices in ecology.” Methods in Ecology and Evolution, 6(7), 853–858. https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/2041-210X.12372.

Corresponding BibTeX entry:

  @Article{,
    title = {{fuzzySim}: applying fuzzy logic to binary similarity
      indices in ecology},
    author = {A. Marcia Barbosa},
    journal = {Methods in Ecology and Evolution},
    year = {2015},
    volume = {6},
    number = {7},
    pages = {853--858},
    url =
      {https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/2041-210X.12372},
  }