@inbook{NBERc3960,
 Crossref = "NBERterl76-1",
 title = "Contraception and Fertility: Household Production under Uncertainty",
 author = "Robert T. Michael and Robert J. Willis",
 BookTitle = "Household Production and Consumption",
 Publisher = "NBER",
 pages = "25-98",
 year = "1976",
 URL = "http://www.nber.org/chapters/c3960",
}
@book{NBERterl76-1,
 title = "Household Production and Consumption",
 author = "Nestor E. Terleckyj",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1976",
 URL = "http://www.nber.org/books/terl76-1",
}