@Book{OL3561303M,
    title: {The jungle},
    author: {Upton Sinclair},
    publisher: {Norton},
    year: {2003},
    place: {New York},
}

@Book{OL47724M,
    title: {Harry Potter and the Prisoner of Azkaban},
    author: {J. K. Rowling},
    publisher: {Thorndike Press},
    year: {2000},
    place: {Thorndike, ME, USA},
}

@Book{OL6178257M,
    title: {Moby-Dick},
    author: {Herman Melville},
    publisher: {Encyclopaedia Britannica},
    year: {1955},
    place: {Chicago},
}

@Book{OL7604000M,
    title: {The Two Towers},
    author: {J.R.R. Tolkien},
    publisher: {Houghton Mifflin Company},
    year: {2001},
    place: {Boston, USA},
}

@Author{OL26320A,
    name: {J.R.R. Tolkien},
    birth_date: {3 January 1892}
    , death_date: {2 September 1973}
}