To cite package ‘TissueEnrich’ in publications use:

  Jain A and Tuteja G (2018). TissueEnrich: Tissue-specific gene
  enrichment analysis. Bioinformatics, bty890,
  https://doi.org/10.1093/bioinformatics/bty890

A BibTeX entry for LaTeX users is

  @Article{,
    title = {TissueEnrich: Tissue-specific gene enrichment analysis},
    author = {Ashish Jain and Geetu Tuteja},
    journal = {Bioinformatics},
    pages = {bty890},
    year = {2018},
    doi = {10.1093/bioinformatics/bty890},
  }