@Work{OL2680436W,
    title: {When Nietzsche Wept},
    author: {Irvin D. Yalom},
    first_publish_year: {1992}
}

@Work{OL450631W,
    title: {The courage to be},
    author: {Paul Tillich},
    first_publish_year: {1952}
}

@Author{OL25380A,
    name: {Paul Tillich},
    birth_date: {1886}
    , death_date: {1965}
}