To cite HapMap in publications use:

The International HapMap Consortium. The International HapMap Project. Nature 426, 789-796 (2003).

The HapMap Consortium invested lots of effort in generating these data. Please cite it.

Corresponding BibTeX entry:

  @Article{,
    title = {The International HapMap Project},
    author = {The HapMap Consortium},
    year = {2003},
    url =
      {http://www.nature.com/nature/journal/v426/n6968/abs/nature02168.html},
    journal = {Nature},
    pages = {789--796},
    volume = {426},
  }