To cite package ‘EthSEQ’ in publications use:

  Alessandro Romanel, Tuo Zhang, Olivier Elemento, Francesca
  Demichelis; EthSEQ: ethnicity annotation from whole exome sequencing
  data. Bioinformatics 2017 btx165. doi: 10.1093/bioinformatics/btx165

A BibTeX entry for LaTeX users is

  @Article{,
    title = {EthSEQ: ethnicity annotation from whole exome sequencing data},
    journal = {Bioinformatics},
    year = {2017},
    author = {Alessandro Romanel and Tuo Zhang and Olivier Elemento and Francesca Demichelis},
  }