To cite package ‘customProDB’ in publications use:

  Xiaojing Wang, Bing Zhang "customProDB: an {R} package to generate
  customized protein databases from RNA-Seq data". Bioinformatics
  (2013) 29:3235-3237.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {customProDB: an R package to generate customized 
        protein databases from RNA-Seq data},
    author = {Xiaojing Wang and Bing Zhang},
    year = {2013},
    journal = {Bioinformatics},
    volume = {29},
    pages = {3235-3237},
    doi = {10.1093/bioinformatics/btt543},
    url = {http://bioinformatics.oxfordjournals.org/content/29/24/3235},
  }