To cite package ‘signeR’ in publications use:

  Rafael A. Rosales, Rodrigo D. Drummond, Renan Valieris, Emmanuel
  Dias-Neto, and Israel T. da Silva (2016): signeR: An empirical
  Bayesian approach to mutational signature discovery. Bioinformatics
  September 1, 2016 doi:10.1093/bioinformatics/btw572

A BibTeX entry for LaTeX users is

  @Article{,
    title = {signeR: An empirical Bayesian approach to mutational signature discovery.},
    author = {Rafael A. Rosales and Rodrigo D. Drummond and Renan Valieris and Emmanuel Dias-Neto and Israel T. da Silva},
    year = {2016},
    journal = {Bioinformatics},
    doi = {10.1093/bioinformatics/btw572},
  }