@Book{OL38564582M,
    title: {Mansfield Park},
    author: {Jane Austen},
    publisher: {Plaza \& Janés},
    year: {2000},
    place: {Barcelona},
}

@Book{OL824527M,
    title: {Heart of darkness},
    author: {Joseph Conrad},
    publisher: {Bedford Books of St. Martin's Press},
    year: {1996},
    place: {Boston, USA},
}

@Author{OL19441A,
    name: {Joseph Conrad},
    birth_date: {3 December 1857}
    , death_date: {3 August 1924}
}