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https://highpeakspureearth.com/2018/introduction-to-the-tibetan-language-an-etextbook-for-spoken-and-literary-tibetan-by-ruth-gamble-tenzin-ringpapontsang-chung-tsering-and-grazia-scotellaro/
"Introduction to the Tibetan Language: An eTextbook for Spoken and Literary Tibetan" By Ruth Gamble, Tenzin Ringpapontsang, Chung Tsering and Grazia Scotellaro