To cite package ‘Director’ in publications use:

  Icay, K.  and Liu, C.  and Hautaniemi, S. (2018): Dynamic
  visualization of multi-level molecular data: The Director package in
  R Comput Methods Programs Biomed 153: 129--136

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Dynamic visualization of multi-level molecular data: The Director package in R},
    author = {Katherine Icay and Chengyu Liu and Sampsa Hautaniemi},
    year = {2018},
    journal = {Comput Methods Programs Biomed},
    volume = {153},
    pages = {129--136},
    month = {Jan},
    doi = {10.1016/j.cmpb.2017.10.013},
    url = {https://www.sciencedirect.com/science/article/pii/S0169260716306964},
  }