@inbook{NBERc4846,
 Crossref = "NBERwill30-1",
 title = "Appendix Tables",
 author = "Pierce Williams and Frederick E. Croxton",
 BookTitle = "Corporation Contributions to Organized Community Welfare Services",
 Publisher = "NBER",
 pages = "245-340",
 year = "1930",
 URL = "http://www.nber.org/chapters/c4846",
}
@book{NBERwill30-1,
 title = "Corporation Contributions to Organized Community Welfare Services",
 author = "Pierce Williams and Frederick E. Croxton",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1930",
 URL = "http://www.nber.org/books/will30-1",
}