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. URL http://www.jstatsoft.org/v63/i17/.

Corresponding BibTeX entry:

  @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},
    url = {http://www.jstatsoft.org/v63/i17/},
  }