To cite GWmodel in publications use:

Isabella Gollini, Binbin Lu, Martin Charlton, Christopher Brunsdon, Paul Harris (2015). “GWmodel: An R Package for Exploring Spatial Heterogeneity Using Geographically Weighted Models.” Journal of Statistical Software, 63(17), 1–50. doi:10.18637/jss.v063.i17.

Binbin Lu, Paul Harris, Martin Charlton, Christopher Brunsdon (2014). “The GWmodel R package: further topics for exploring spatial heterogeneity using geographically weighted models.” Geo-spatial Information Science, 17(2), 85–101. doi:10.1080/10095020.2014.917453.

Corresponding BibTeX entries:

  @Article{,
    title = {{GWmodel}: An {R} Package for Exploring Spatial
      Heterogeneity Using Geographically Weighted Models},
    author = {{Isabella Gollini} and {Binbin Lu} and {Martin Charlton}
      and {Christopher Brunsdon} and {Paul Harris}},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {63},
    number = {17},
    pages = {1--50},
    doi = {10.18637/jss.v063.i17},
  }

  @Article{,
    title = {The {GWmodel} {R} package: further topics for exploring
      spatial heterogeneity using geographically weighted models},
    author = {{Binbin Lu} and {Paul Harris} and {Martin Charlton} and
      {Christopher Brunsdon}},
    journal = {Geo-spatial Information Science},
    year = {2014},
    volume = {17},
    number = {2},
    pages = {85--101},
    doi = {10.1080/10095020.2014.917453},
  }