Volumes I-III, X-XIV, XX, XXV and XXVIII are out of print
CH'EN YÜAN, Western and Central Asians in China under the Mongols — Their Transformation into Chinese. Translated and annotated by CH'IEN HSING-HAI and L. CARRINGTON GOODRICH,
Los Angeles 1966, 328 pp.
Reprint: St. Augustin — Nettetal 1989 (paperback).