To cite package 'ecoreg' in publications use:

Jackson CH, Best NG, Richardson S (2008). “Hierarchical related regression for combining aggregate and individual data in studies of socio-economic disease risk factors.” Journal of the Royal Statistical Society, Series A: Statistics In Society, 171(1), 159-178.

Corresponding BibTeX entry:

  @Article{,
    title = {Hierarchical related regression for combining aggregate
      and individual data in studies of socio-economic disease risk
      factors},
    author = {C. H. Jackson and N. G. Best and S. Richardson},
    year = {2008},
    journal = {Journal of the Royal Statistical Society, Series A:
      Statistics In Society},
    volume = {171},
    number = {1},
    pages = {159-178},
  }