http://www.crs.gov
http://www.gao.gov/new.items/d02509.pdf
http://www.irs.gov/uac/SOI-Tax-Stats--Individual-Statistical-Tables-by-Size-of-Adjusted-Gross-Income
http://www.irs.gov/uac/SOI-Tax-Stats--Individual-Statistical-Tables-by-Size-of-Adjusted-Gross-Income
http://www.irs.gov/uac/SOI-Tax-Stats--Individual-Statistical-Tables-by-Size-of-Adjusted-Gross-Income
http://www.irs.gov/uac/SOI-Tax-Stats--Individual-Statistical-Tables-by-Size-of-Adjusted-Gross-Income
http://www.irs.gov/uac/SOI-Tax-Stats--Individual-Statistical-Tables-by-Size-of-Adjusted-Gross-Income
http://www.irs.gov/uac/SOI-Tax-Stats--Individual-Statistical-Tables-by-Size-of-Adjusted-Gross-Income
http://www.taxpolicycenter.org/taxtopics/Limit-Itemized-Deductions.cfm
http://www.whitehouse.gov/sites/
http://papers.nber.org/papers/w16921
http://www.taxpolicycenter.org/taxtopics/Limit-Itemized-Deductions.cfm
http://www.urban.org/UploadedPDF/412586-Evaluating-the-Charitable-Deduction-andProposed-Reforms.pdf