@inbook{NBERc11711,
 Crossref = "NBERkmen80-1",
 title = "Token Economy and Animal Models for the Experimental Analysis of Economic Behavior",
 author = "John H. Kagel and Raymond C. Battalio",
 BookTitle = "Evaluation of Econometric Models",
 Publisher = "Academic Press",
 pages = "379-401",
 year = "1980",
 URL = "http://www.nber.org/chapters/c11711",
}
@book{NBERkmen80-1,
 title = "Evaluation of Econometric Models",
 author = "Jan Kmenta and James B. Ramsey",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Academic Press",
 year = "1980",
 URL = "http://www.nber.org/books/kmen80-1",
}