To cite the MALDIquant package in publications use:

Gibb S, Strimmer K (2012). “MALDIquant: a versatile R package for the analysis of mass spectrometry data.” Bioinformatics, 28(17), 2270–2271. doi:10.1093/bioinformatics/bts447.

Corresponding BibTeX entry:

  @Article{MALDIquant,
    title = {{MALDI}quant: a versatile {R} package for the analysis of
      mass spectrometry data},
    author = {Sebastian Gibb and Korbinian Strimmer},
    volume = {28},
    number = {17},
    pages = {2270--2271},
    year = {2012},
    doi = {10.1093/bioinformatics/bts447},
    journal = {Bioinformatics},
    publisher = {Oxford University Press},
  }