To cite the mashr package in publications use:

  Sarah Urbut, Gao Wang, Peter Carbonetto and Matthew Stephens (2019).
  Flexible statistical methods for estimating and testing effects in
  genomic studies with multiple conditions. Nature Genetics 51(1),
  187-195.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Flexible statistical methods for estimating and testing effects in genomic studies with multiple conditions},
    author = {{Sarah Urbut} and {Gao Wang} and {Peter Carbonetto} and {Matthew Stephens}},
    journal = {Nature Genetics},
    volume = {51},
    number = {1},
    pages = {187--195},
    year = {2019},
  }