@Work{OL640191W,
    title: {Planetary herbology},
    author: {Michael Tierra},
    first_publish_year: {1988}
}

@Work{OL640188W,
    title: {The east west herb course},
    author: {Michael Tierra},
    first_publish_year: {1996}
}

@Author{OL49334A,
    name: {Michael Tierra},
    birth_date: {1939}
}