Sogdiana
Rong, Xinjiang, "The Sogdian Caravan as Depicted in the Relieves of the Stone Sarcophagus from Shi's Tomb of the Northern Zhou" in Chinese Archaeology. Volume 6, Issue 1, pp. 181–185, ISSN (Online) 2160–5068, ISSN (Print) 5004–4295, DOI: 10.1515/CHAR.2006.6.1.181, January 2006.