"The Indo-Sassanian coins, also termed as Gadahiya and circulated from 600 to 1200 A.D., are found in good numbers from Ahmadahad, Banaskantha, Bhavanagar, Junagarh, Kaira, Kutch, Mehsana, of Gujarat." in The Journal of Academy of Indian Numismatics & Sigillography (in ஆங்கிலம்). Academy of Indian Numismatics & Sigillography. 1988. p. 145.
Reddy, Deme Raja (2014). "The Emergence and Spread of Coins in Ancient India". In Bernholz, Peter; Vaubel, Roland (eds.). Explaining Monetary and Financial Innovation. Financial and Monetary Policy Studies (in ஆங்கிலம்). Vol. 39. Springer International Publishing. pp. 53–77. doi:10.1007/978-3-319-06109-2_4. ISBN978-3-319-06109-2. {{cite book}}: |work= ignored (help)
Goyal, Shankar (2000). "Historiography of the Punch-Marked Coins". Annals of the Bhandarkar Oriental Research Institute81 (1/4): 153–168. பன்னாட்டுத் தர தொடர் எண்:0378-1143.