To cite the SNPMaP package in publications use:

Davis, O.S.P., Plomin, R., & Schalkwyk, L.C. (2009). The SNPMaP package for R: A framework for genome-wide association using DNA pooling on microarrays. Bioinformatics, 25, 281-283. doi:10.1093/bioinformatics/btn587

Corresponding BibTeX entry:

  @Article{,
    author = {Oliver S. P. Davis and Robert Plomin and Leo C.
      Schalkwyk},
    title = {The SNPMaP package for R: A framework for genome-wide
      association using DNA pooling on microarrays},
    journal = {Bioinformatics},
    volume = {25},
    year = {2009},
    pages = {281-283},
    url = {http://dx.doi.org/10.1093/bioinformatics/btn587},
  }