To cite surface use:

Ingram, T. & Mahler, D.L. (2013) SURFACE: detecting convergent evolution from comparative data by fitting Ornstein-Uhlenbeck models with stepwise AIC. Methods in Ecology and Evolution 4: 416-425. doi:10.1111/2041-210X.12034

Corresponding BibTeX entry:

  @Article{,
    title = {SURFACE: detecting convergent evolution from comparative
      data by fitting Ornstein-Uhlenbeck models with stepwise AIC.
      Methods in Ecology and Evolution 4: 416-425. },
    author = {{Ingram} and T. & Mahler and {D.L.}},
    journal = {Methods in Ecology and Evolution},
    year = {2013},
    volume = {4},
    pages = {416-425},
  }