@inbook{NBERc6786, Crossref = "NBERclot85-1", title = "Appendix G: Comparison of Aggregate Tax-Rate Variables", author = "Charles T. Clotfelter", BookTitle = "Federal Tax Policy and Charitable Giving", Publisher = "University of Chicago Press", pages = "300", year = "1985", URL = "http://www.nber.org/chapters/c6786", } @book{NBERclot85-1, title = "Federal Tax Policy and Charitable Giving", author = "Charles T. Clotfelter", institution = "National Bureau of Economic Research", type = "Book", publisher = "University of Chicago Press", year = "1985", URL = "http://www.nber.org/books/clot85-1", }