Caucasian Rugs : A detailed presentation of the art of carpet weaving in the various districts of the Caucasus during the 18th and 19th century by Ulrich Schurmann. Publication year 1990 and publisher Old 99 Associates; 4th Printing edition (1990). 359 pages.
Central-Asian Rugs: A Detailed Presentation of the Art of Rug Weaving in Central-Asia in the Eighteenth and Nineteenth Century by Ulrich Schurmann. Publication year 1969 and publisher Verlag Osterreith. pages.