Hard to believe as to the mean shopper income for Target.(I assume you meant the mean) However, you did the research.
My papers were all in 2007 and came from a for-pay research site that I got access to through the university. The data on this site was generally from peer reviewed papers or from company forms filled out for their income tax and published with their stock reports. But here is something from the regular net. The numbers are close, but of course different.