To cite WhopGenome package in publications use:

Wittelsb├╝rger, U. et al. (2015) WhopGenome: high-speed access to whole-genome variation and sequence data in R. Bioinformatics 31(3): 413-415.<doi:10.1093/bioinformatics/btu636>

Corresponding BibTeX entry:

  @Article{,
    title = {WhopGenome: high-speed access to whole-genome variation
      and sequence data in R},
    journal = {Bioinformatics},
    year = {2015},
    author = {Ulrich Wittelsb├╝rger and Bastian Pfeifer and Martin J.
      Lercher},
    volume = {31},
    pages = {413-415},
    doi = {10.1093/bioinformatics/btu636},
  }