To cite GOplot in publications use:

Walter, Wencke, Fatima Sanchez-Cabo, and Mercedes Ricote. GOplot: an R package for visually combining expression data with functional analysis. Bioinformatics (2015): btv300.

Corresponding BibTeX entry:

  @Article{,
    title = {GOplot: an R package for visually combining expression
      data with functional analysis},
    author = {Wencke Walter and Fatima Sanchez-Cabo and Mercedes
      Ricote},
    journal = {Bioinformatics},
    year = {2015},
  }