To cite R package cosmicsig in publications use:

Rozen S, Jiang N (2021). cosmicsig: Mutational Signatures Data from COSMIC (the Catalogue of Somatic Mutations in Cancer). R package version 1.0.4.

Corresponding BibTeX entry:

  @Manual{,
    title = {cosmicsig: Mutational Signatures Data from COSMIC (the
      Catalogue of Somatic Mutations in Cancer)},
    author = {Steven Rozen and Nanhai Jiang},
    year = {2021},
    note = {R package version 1.0.4},
  }