Bopearachchi & Cribb, Coins illustrating the History of the Crossroads of Asia 1992, pp. 56–57: "In the same hoard there were also discovered two series of local silver coins which appear to be the product of the local Achaemenid administration. One series (no. 8) was made in the same way as the Greek coins in the hoard, but with novel designs of local origin, and the other (no. 9) had similar local design but made in a new way, which relates it to the silver punch-marked coins of India. It appears that it was these local coins, using technology adapted from Greek coins, which provided the prototypes for punch-marked coins, the earliest coins made in India." NB: Series No.8 refers to the cup-shaped coins, series no. 9 refers to the bent-bar punch-marked coins presented in this article. Bopearachchi, Osmund; Cribb, Joe (1992), "Coins illustrating the History of the Crossroads of Asia", in Errington, Elizabeth; Cribb, Joe; Claringbull, Maggie (eds.), The Crossroads of Asia: transformation in image and symbol in the art of ancient Afghanistan and Pakistan, Ancient India and Iran Trust, pp. 57–59, ISBN978-0-9518399-1-1
"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. 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. 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)
Kumar, Krishna (1992). "The Silver Plates of the Gungeria Hoard: Their Monetary Significance". Journal of the Economic and Social History of the Orient. 35 (1): 72–94. doi:10.2307/3632688. ISSN0022-4995. JSTOR3632688.
Allchin, F. R. (1964). "An Inscribed Weight from Mathurā". Journal of the Economic and Social History of the Orient. 7 (2): 201–205. doi:10.2307/3596241. ISSN0022-4995. JSTOR3596241.
Chattopadhyaya, B. D. (2008). "D D Kosambi and the Study of Early Indian Coins". Economic and Political Weekly. 43 (30): 97–102. ISSN0012-9976. JSTOR40277774.
Kumar, Krishna (1992). "The Silver Plates of the Gungeria Hoard: Their Monetary Significance". Journal of the Economic and Social History of the Orient. 35 (1): 72–94. doi:10.2307/3632688. ISSN0022-4995. JSTOR3632688.
Allchin, F. R. (1964). "An Inscribed Weight from Mathurā". Journal of the Economic and Social History of the Orient. 7 (2): 201–205. doi:10.2307/3596241. ISSN0022-4995. JSTOR3596241.
Goyal, Shankar (2000). "Historiography of the Punch-Marked Coins". Annals of the Bhandarkar Oriental Research Institute. 81 (1/4): 153–168. ISSN0378-1143. JSTOR41694610.
Chattopadhyaya, B. D. (2008). "D D Kosambi and the Study of Early Indian Coins". Economic and Political Weekly. 43 (30): 97–102. ISSN0012-9976. JSTOR40277774.
Kumar, Krishna (1992). "The Silver Plates of the Gungeria Hoard: Their Monetary Significance". Journal of the Economic and Social History of the Orient. 35 (1): 72–94. doi:10.2307/3632688. ISSN0022-4995. JSTOR3632688.
Allchin, F. R. (1964). "An Inscribed Weight from Mathurā". Journal of the Economic and Social History of the Orient. 7 (2): 201–205. doi:10.2307/3596241. ISSN0022-4995. JSTOR3596241.
Goyal, Shankar (2000). "Historiography of the Punch-Marked Coins". Annals of the Bhandarkar Oriental Research Institute. 81 (1/4): 153–168. ISSN0378-1143. JSTOR41694610.