To cite package ‘normalize450K’ in publications use:

  Heiss, Jonathan A., and Hermann Brenner: Between-array normalization
  for 450K data. Frontiers in genetics 6 (2015).

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Between-array normalization for 450K data},
    author = {{Heiss} and Jonathan A. and Hermann Brenner},
    journal = {Frontiers in genetics},
    volume = {6},
    number = {92},
    year = {2015},
  }