-[1] [CITE@en[Google Books: how to get the full text of public domain books]], [TIME[2021-03-09T02:37:31.000Z]] <https://www.storytracer.org/google-books-how-to-get-the-full-text-of-public-domain-books/>
-- [2] 消滅確認 [TIME[2023-05-16T13:33:23.400Z]]
-- [3] 
[CITE@en[Google Books: how to get the full text of public domain books]], [TIME[2023-05-16T13:32:52.000Z]], [TIME[2021-02-25T18:11:47.290Z]] <https://web.archive.org/web/20210225181111/https://www.storytracer.org/google-books-how-to-get-the-full-text-of-public-domain-books/>