Author: Specht, Franz
Publisher:Vandenhoeck & Ruprecht, Gottingen
Copyright:1943
Author: Brockelmann, C
Publisher:E J Brill, Leiden
Copyright:1938
Author: Widengren, Geo
Publisher:
Copyright:1938
Author: Markwart, Josef
Publisher:E. J. Brill, Leiden
Copyright:1938