@inbook{NBERc5516,
 Crossref = "NBERwolm30-1",
 title = "The Problem of Control",
 author = "Leo Wolman",
 BookTitle = "Planning and Control of Public Works",
 Publisher = "NBER",
 pages = "168-182",
 year = "1930",
 URL = "http://www.nber.org/chapters/c5516",
}
@book{NBERwolm30-1,
 title = "Planning and Control of Public Works",
 author = "Leo Wolman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1930",
 URL = "http://www.nber.org/books/wolm30-1",
}