To cite package 'signatureSearch' in publications use:

  Duan Y, Evans DS, Miller RA, Schork NJ, Cummings SR and Girke T
  (2020). signatureSearch: environment for gene expression signature
  searching and functional interpretation. Nucleic Acids Res, 48(21),
  e124. doi: 10.1093/nar/gkaa878.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {signatureSearch: environment for gene expression signature searching and functional interpretation},
    author = {Yuzhu Duan and Dan S. Evans and Richard A. Miller and Nicholas J. Schork and Steven R. Cummings and Thomas Girke},
    year = {2020},
    month = {oct},
    publisher = {Oxford University Press ({OUP})},
    journal = {Nucleic Acids Res},
    doi = {10.1093/nar/gkaa878},
    url = {https://doi.org/10.1093/nar/gkaa878},
    volume = {48},
    number = {21},
    pages = {e124},
  }