Marlia Mundell. Byzantine Trade: Local, Regional, Interregional, and International See http://www.gowerpublishing.com/pdf/SamplePages/Byzantine_Trade_4th_12th_Centuries_Ch1
Falun. ISBN 91-88930-32-7 p. 135. J M Hussey, The Byzantine World, Hutchinson, London, 1967, p. 92. Silk Road Seattle – Constantinople (页面存档备份,存于互联网档案馆)