To cite pathview:

  Luo, W. and Brouwer C., Pathview: an R/Bioconductor package for
  pathway-based data integration and visualization. Bioinformatics,
  2013, 29(14): 1830-1831, doi: 10.1093/bioinformatics/btt285

A BibTeX entry for LaTeX users is

  @Article{,
    author = {{Luo} and {Weijun} and {Brouwer} and {Cory}},
    title = {Pathview: an R/Bioconductor package for pathway-based data integration and visualization},
    journal = {Bioinformatics},
    year = {2013},
    doi = {10.1093/bioinformatics/btt285},
    volume = {29},
    number = {14},
    pages = {1830-1831},
  }

This free open-source software implements academic research by the
authors. Its development took a large amount of extra time and effort.
If you use it, please support the project by citing the listed journal
articles.