To cite sns in publications use:

  Alireza S. Mahani, Asad Hasan, Marshall Jiang, Mansour T. A.
  Sharabiani (2016). Stochastic Newton Sampler: The R Package sns.
  Journal of Statistical Software, Code Snippets, 74(2), 1-33.
  doi:10.18637/jss.v074.c02

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Stochastic Newton Sampler: The {R} Package {sns}},
    author = {Alireza S. Mahani and Asad Hasan and Marshall Jiang and Mansour T. A. Sharabiani},
    journal = {Journal of Statistical Software, Code Snippets},
    year = {2016},
    volume = {74},
    number = {2},
    pages = {1--33},
    doi = {10.18637/jss.v074.c02},
  }