To cite codelink in publications use:

  Diego Diez, Rebeca Alvarez and Ana Dopazo. codelink: An R package for
  analysis of GE Healthcare Gene Expression Bioarrays. 2007,
  Bioinformatics

A BibTeX entry for LaTeX users is

  @Article{,
    title = {codelink: an R package for analysis of GE Healthcare Gene
	Expression Bioarrays},
    author = {{Diego Diez} and {Rebeca Alvarez} and {Ana Dopazo}},
    year = {2007},
    journal = {Bioinformatics},
    volume = {23},
    number = {9},
    pages = {1168-9},
    doi = {10.1093/bioinformatics/btm072},
  }