To cite 'multitaper' in publications please use:

  K J Rahim, W S Burr and D J Thomson, Appendix A: Multitaper R Package
  in "Applications of Multitaper Spectral Analysis to Nonstationary
  Data," PhD diss., Queen's University, 2014, pp. 149-183,
  http://hdl.handle.net/1974/12584

A BibTeX entry for LaTeX users is

  @PhdThesis{,
    title = {Applications of Multitaper Spectral Analysis to Nonstationary Data},
    chapter = {Appendix A: Multitaper R Package},
    author = {Karim J Rahim and Wesley S Burr and David J Thomson},
    year = {2014},
    note = {R package version 1.0-17},
    pages = {149--183},
    school = {Queen's University},
    url = {https://CRAN.R-project.org/package=multitaper},
  }