To cite package ‘MethylAid’ in publications use:

  van Iterson M, et al. (2014) MethylAid: Visual and interactive
  quality control of large Illumina 450k data sets. Bioinformatics

A BibTeX entry for LaTeX users is

  @Article{,
    title = {MethylAid: Visual and interactive quality control of large Illumina 450k data sets},
    author = {Maarten {van Iterson} and Elmar W. Tobi and Roderick C. Slieker and Wouter {den Hollander} and Ren\`e Luijk and P. Eline Slagboom and Bastiaan T. Heijmans},
    year = {2014},
    journal = {Bioinformatics},
    volume = {30},
    issue = {23},
    url = {http://bioinformatics.oxfordjournals.org/content/30/23/3435},
  }