For SNP information, good practice is searching on dbSNP: http://www.ncbi.nlm.nih.gov/projects/SNP/snp_ref.cgi?rs=11560324 . There are a number of information there, and in "validation" you should find some references there...
dbSNP is a good start. It could be the SNP you are looking is not published but it is in linkage disequilibrium to a SNP which is functional and have been published. In this case, I will first look up what are the other SNP in LD to it using SNPA Proxy Search to identify those LD SNPs, and then look them up in the dbSNP to see whether they are published. Hope this is helpful.