@book { AnInvestigationIntotheEconomicDeterminantsofFertility,
    title = "An Investigation Into the Economic Determinants of Fertility",
    author = "Robert Allen {Kohl}",
    year = "1984",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1073485"
}