To cite package 'EnvStats' in publications use:

  Millard SP (2013). _EnvStats: An R Package for Environmental
  Statistics_. Springer, New York. ISBN 978-1-4614-8455-4,
  <https://www.springer.com>.

A BibTeX entry for LaTeX users is

  @Book{EnvStats-book,
    title = {EnvStats:  An R Package for Environmental Statistics},
    author = {Steven P. Millard},
    year = {2013},
    publisher = {Springer},
    address = {New York},
    isbn = {978-1-4614-8455-4},
    url = {https://www.springer.com},
  }