found: Britannica Micro.
found: Mongolchuudyn useg bichigiin tovchoon, 2001:p. 80 (Dȯrvȯlzhin bichig [in Mong. script: Dȯrbejin bicig]; Phags-pa script; created 1269 by Phags-pa Bio-gros-rgyal-mtshan at the request of Kublai Khan; based upon Tibetan; most existing texts in Mongolian)
found: The Mongolian monuments in Ḥpʻags-pa script, 1957:pref. (used in the Yuan empire to write not only in Mongolian, but also in Chinese and other languages)
found: Encyclopedia of Mongolia and Mongol Empire, 2004:page 519 (Square script ('Phags-pa Script) designed as a universal script for the Mongol Empire.)