Which HapMap Citation to cite if pulling information from dbSNP

Question

[LauferVA]

Hello,

I want to cite the fact that a certain SNP is essentially absent from Yoruban Populations using the Hapmap data found here:

http://www.ncbi.nlm.nih.gov/projects/SNP/snp_ref.cgi?rs=2476601

Which version of HapMap, corresponding to which citation, should I cite for that?