@Book{OL16297782M,
    title: {Thoreau's Walden},
    author: {Henry David Thoreau},
    publisher: {Longmans, Green, and co.},
    year: {1910},
    place: {New York [etc.]},
}

@Work{OL55649W,
    title: {Walden},
    author: {Henry David Thoreau},
    first_publish_year: {1854}
}

@Author{OL19690A,
    name: {Henry David Thoreau},
    birth_date: {12 July 1817}
    , death_date: {6 May 1862}
}