@Book{OL23321225M,
    title: {Natural history},
    author: {Pliny the Elder},
    publisher: {W. Heinemann},
    year: {1938},
    place: {London},
}

@Work{OL102329W,
    title: {Epistulae morales},
    author: {Seneca the Younger},
    first_publish_year: {1917}
}

@Author{OL3143587A,
    name: {Seneca the Younger},
    birth_date: {c. 4 B.C.}
    , death_date: {65 A.D.}
}