Source attribution and transformations: https://book.billionare.me/sources
Books: zygmuntz/goodbooks-10k, CC BY-SA 4.0. Original CSV unchanged.
Quotes: dwyl/quotes GPL-2.0, lukin0110/quotes Apache-2.0. Historical-author and length selection only.
Classics: chinese-poetry/chinese-poetry MIT; traditional-to-simplified conversion, paragraph selection, deduplication.
Original readings are editorial interpretations, not quotations.