To cite package icensBKL in publications use:

Kris Bogaerts, Arnošt Komárek, Emmanuel Lesaffre (2017). Survival Analysis with Interval-Censored Data: A Practical Approach. Boca Raton: Chapman & Hall/CRC. ISBN 978-1-4200-7747-6. URL https://www.crcpress.com/Survival-Analysis-with-Interval-Censored-Data-A-Practical-Approach-with/Bogaerts-Komarek-Lesaffre/p/book/9781420077476.

Corresponding BibTeX entry:

  @Book{,
    title = {Survival Analysis with Interval-Censored Data: A Practical
      Approach},
    author = {Kris Bogaerts and Arno\v{s}t Kom\'arek and Emmanuel
      Lesaffre},
    publisher = {Chapman and Hall/CRC},
    address = {Boca Raton},
    year = {2017},
    url =
      {https://www.crcpress.com/Survival-Analysis-with-Interval-Censored-Data-A-Practical-Approach-with/Bogaerts-Komarek-Lesaffre/p/book/9781420077476},
  }