To cite package ‘clippda’ in publications use:

  Nyangoma, Collins SO, Altman SI, Johnson DG, Philip;, Billingham, J.
  L (2012). “Sample Size Calculations for Designing Clinical Proteomic
  Profiling Studies Using Mass Spectrometry.” _Statistical Applications
  in Genetics and Molecular Biology_, *11*. ISSN 3.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {{Nyangoma} and Stephen O.; Collins and Stuart I.; Altman and Douglas G.; Johnson and {Philip;} and {Billingham} and Lucinda J.},
    title = {Sample Size Calculations for Designing Clinical Proteomic 
                  Profiling Studies Using Mass Spectrometry},
    journal = {Statistical Applications in Genetics and Molecular Biology},
    volume = {11},
    issn = {3},
    article = {2},
    year = {2012},
  }