Per anno

@book{nietsche1908,
    address = {Leipzig, Germany},
    apice = {Nietzsche1908},
    author = {Nietzsche, Friedrich},
    publisher = {Insel Verlag},
    title = {Ecce Homo. Wie man wird, was man ist},
    url = {https://www.gutenberg.org/ebooks/7202},
    year = 1908
}