@inbook{NBERc8431,
 Crossref = "NBERhoop91-1",
 title = "Developing a Data System for International Sales of Services: Progress, Problems, and Prospects",
 author = "Bernard Ascher and Obie G. Whichard",
 BookTitle = "International Economic Transactions: Issues in Measurement and Empirical Research",
 Publisher = "University of Chicago Press",
 pages = "203-236",
 year = "1991",
 month = "January",
 URL = "http://www.nber.org/chapters/c8431",
}
@book{NBERhoop91-1,
 title = "International Economic Transactions: Issues in Measurement and Empirical Research",
 author = "Peter Hooper and J. David Richardson",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1991",
 URL = "http://www.nber.org/books/hoop91-1",
}