If you use coloc.bma or coloc.test with argument bayes=TRUE

Wallace, al Ce (2012). “Statistical colocalisation of monocyte gene expression and genetic risk variants for type 1 diabetes.” Hum Mol Genet. http://dx.doi.org/10.1093/hmg/dds098.

If you use coloc.pcs or coloc.bma

Wallace, C. (2013). “Statistical testing of shared genetic control for potentially related traits.” ArXiv e-prints. 1301.5510, http://arxiv.org/abs/1301.5510.

If you use coloc.abf

Giambartolomei, C., Vukcevic, D., Schadt, E.~E., Hingorani, A.~D., Wallace, C., Plagnol, V. (2013). “Bayesian test for co-localisation between pairs of genetic association studies using summary statistics.” ArXiv e-prints. 1305.4022, http://arxiv.org/abs/1305.4022.

Corresponding BibTeX entries:

  @Article{,
    author = {{Wallace} and C et. al},
    title = {Statistical colocalisation of monocyte gene expression and
      genetic risk variants for type 1 diabetes.},
    journal = {Hum Mol Genet},
    year = {2012},
    url = {http://dx.doi.org/10.1093/hmg/dds098},
  }

  @Article{,
    author = {{{Wallace}} and {C.}},
    title = {{Statistical testing of shared genetic control for
      potentially related traits}},
    journal = {{ArXiv e-prints}},
    archiveprefix = {arXiv},
    eprint = {{1301.5510}},
    primaryclass = {q-bio.GN},
    keywords = {{Quantitative Biology - Genomics, Statistics -
      Applications}},
    year = {2013},
    month = {jan},
    url = {http://arxiv.org/abs/1301.5510},
  }

  @Article{,
    author = {{{Giambartolomei}} and {C.} and {{Vukcevic}} and {D.} and
      {{Schadt}} and {E.~E.} and {{Hingorani}} and {A.~D.} and
      {{Wallace}} and {C.} and {{Plagnol}} and {V.}},
    title = {{Bayesian test for co-localisation between pairs of
      genetic association studies using summary statistics}},
    journal = {{ArXiv e-prints}},
    archiveprefix = {arXiv},
    eprint = {{1305.4022}},
    primaryclass = {q-bio.GN},
    keywords = {{Quantitative Biology - Genomics}},
    year = {2013},
    month = {may},
    url = {http://arxiv.org/abs/1305.4022},
  }