@inbook{NBERc8371,
 Crossref = "NBERhaus85-1",
 title = "Introduction to "Social Experimentation"",
 author = "Jerry A. Hausman and David A. Wise",
 BookTitle = "Social Experimentation",
 Publisher = "University of Chicago Press",
 pages = "1-10",
 year = "1985",
 URL = "http://www.nber.org/chapters/c8371",
}
@book{NBERhaus85-1,
 title = "Social Experimentation",
 author = "Jerry A. Hausman and David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1985",
 URL = "http://www.nber.org/books/haus85-1",
}