@Book{OL24091388M,
    title: {Our Greatest Gift},
    author: {Henri J. M. Nouwen},
    publisher: {HarperOne},
    year: {2009},
}

@Book{OL661369M,
    title: {Henri Nouwen},
    author: {Jurjen Beumer},
    publisher: {Crossroad Pub. Co.},
    year: {1997},
    place: {New York},
}

@Work{OL1913384W,
    title: {Aging},
    author: {Henri J. M. Nouwen and Henri Nouwen and Walter J. Gaffney},
    first_publish_year: {1974}
}

@Author{OL229188A,
    name: {Henri J. M. Nouwen},
    birth_date: {1932}
    , death_date: {1996}
}
@Author{OL2677107A,
    name: {Henri Nouwen},
}
@Author{OL2677108A,
    name: {Walter J. Gaffney},
}