@Book{OL3940674M,
    title: {The Silmarillion},
    author: {J.R.R. Tolkien},
    publisher: {Houghton Mifflin},
    year: {2001},
    place: {Boston},
}

@Work{OL8193478W,
    title: {Oliver Twist},
    author: {Charles Dickens},
    first_publish_year: {1838}
}

@Work{OL258902W,
    title: {Macbeth},
    author: {William Shakespeare},
    first_publish_year: {1508}
}

@Author{OL9388A,
    name: {William Shakespeare},
    birth_date: {20 April 1564}
    , death_date: {23 April 1616}
}