To cite Smisc in publications use:

Sego LH. 2016. Smisc: Sego Miscellaneous. A collection of functions for statistical computing and data manipulation in R. Pacific Northwest National Laboratory. https://pnnl.github.io/Smisc.

Corresponding BibTeX entry:

  @Manual{,
    title = {{Smisc: Sego Miscellaneous. A collection of functions for
      statistical computing and data manipulation in R}},
    author = {Landon Sego},
    organization = {{Pacific Northwest National Laboratory}},
    address = {Richland, WA},
    year = {2016},
    url = {https://pnnl.github.io/Smisc},
  }