To cite package ‘retriever’ in publications use:

  Osorio D, Kuijjer M (2021). _retriever: Generate Disease-Specific
  Response Signatures from the LINCS-L1000 Data_. R package version
  0.2.1, <https://CRAN.R-project.org/package=retriever>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {retriever: Generate Disease-Specific Response Signatures from the
LINCS-L1000 Data},
    author = {Daniel Osorio and Marieke Kuijjer},
    year = {2021},
    note = {R package version 0.2.1},
    url = {https://CRAN.R-project.org/package=retriever},
  }