The following authors and books have mentions of the Cyrus Crown Brand, and or the Dilmaghani Firm’s production.

Edwards, Cecil (1975). The Persian Carpet. Duckworth Pub.
The Persian Carpet
Ittig, Annette (1986). The Kirmani Boom – A Study in Entrepreneurship.
Nemati, Parviz (1980). Rugs as an investment. New York: Agate Press. p. 94.
Rugs As An Investment
“The International Journal of Oriental carpets and textiles”. HALI 15 (6): 74. 1993.