Suggested citation for smwrStats:

  Lorenz, D.L., in preparation, smwrStats--An R package for the
  analysis of hydrologic data, Version 0.7.5: U.S. Geological Survey
  Open File Report

A BibTeX entry for LaTeX users is

  @TechReport{,
    title = {smwrStats--An R package for the analysis of hydrologic data, Version 0.7.5},
    author = {Dave Lorenz},
    institution = {U.S. Geological Survey},
    series = {Open File Report},
    year = {in preparation},
  }