@Book{OL6200208M,
    title: {The portable age of reason reader.},
    author: {Crane Brinton},
    publisher: {Viking Press},
    year: {1956},
    place: {New York},
}

@Book{OL4538534M,
    title: {The portable Voltaire},
    author: {Voltaire},
    publisher: {Penguin Books},
    year: {1977},
    place: {New York},
}

@Author{OL32293A,
    name: {Voltaire},
    birth_date: {21 November 1694}
    , death_date: {30 May 1778}
}