To cite package ‘wqindex’ in publications use:

  Thorley J, Millar C, Teucher A (2018). _wqindex: Water Quality Index
  Calculation for British Columbia_. R package version 0.3.1.9001,
  <https://github.com/bcgov/wqindex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {wqindex: Water Quality Index Calculation for British Columbia},
    author = {Joe Thorley and Colin Millar and Andy Teucher},
    year = {2018},
    note = {R package version 0.3.1.9001},
    url = {https://github.com/bcgov/wqindex},
  }