To cite SWMPr in publications use:

  Beck MW (2016). “SWMPr: An R Package for Retrieving, Organizing, and
  Analyzing Environmental Data for Estuaries.” _The R Journal_, *8*(1),
  219-232. doi:10.32614/RJ-2016-015
  <https://doi.org/10.32614/RJ-2016-015>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{SWMPr: An R Package for Retrieving, Organizing, and Analyzing Environmental Data for Estuaries}},
    author = {Marcus W. Beck},
    journal = {{The R Journal}},
    year = {2016},
    volume = {8},
    number = {1},
    pages = {219-232},
    doi = {10.32614/RJ-2016-015},
  }